You’ve Heard These Religious Rules. Here’s the Meaning Behind Them.

You’ve probably heard at least a few of the rules. Islam prohibits pork. Jews who keep kosher separate meat and dairy. Sikh tradition calls for keeping hair uncut. Catholics abstain from meat on certain Fridays. Many Hindus avoid beef.

From the outside, religious rules can look like a collection of restrictions whose purposes are difficult to understand. That leaves room for familiar explanations: pork was banned because it was unsafe, Catholic Friday abstinence was designed to help fishermen, or Hindu beef avoidance exists simply because Hindus “worship cows.”

But those explanations can confuse a rule’s religious basis with theories about its history—or overlook how believers understand it today.

Sometimes the starting point is a scriptural command. Sometimes it is an interpretation developed within a religious tradition. Sometimes the practice brings together devotion, discipline, community identity, and centuries of cultural change.

You’ve heard the rule. Here’s more of the story.

1. Muslims Don’t Avoid Pork Simply Because It Was Dangerous to Eat

One of the world’s best-known religious dietary rules is often explained as an ancient food-safety measure.

But that is not the basis the Quran gives for the prohibition. Quran 2:173 explicitly lists swine among prohibited foods. Its surrounding context calls believers to eat what God has provided and give thanks to Him.

For Muslims following that command, avoiding pork is therefore fundamentally a matter of religious obedience. The rule does not depend on proving that pork is less healthy than beef or that modern cooking methods cannot make it safe.

The same passage also allows an exception for someone compelled by necessity, provided the person does not exceed the immediate need. That qualification matters: the prohibition is not intended to require someone to die rather than eat otherwise forbidden food.

A health-based explanation may sound practical to an outsider. But it misses the religious question at the center of the practice.

Not simply: “Can this food be made safe?”

But: “Has God permitted it?”

2. Jews Avoid Pork Because It Fails the Torah’s Test for Permitted Land Animals

Judaism prohibits pork too, but the Torah places the pig within a broader classification of animals.

Leviticus 11 and Deuteronomy 14 specify that permitted land mammals must have fully split hooves and chew their cud. Cows, sheep, and goats meet both criteria. Pigs have split hooves but do not chew their cud, so they are prohibited.

That is the immediate biblical reason pork is not kosher. It is not, however, a complete explanation of why the Torah established those particular criteria in the first place.

There is another distinction worth knowing: being a permitted species does not automatically make an animal’s meat kosher. Jewish law also imposes requirements concerning slaughter, removal of blood, and preparation.

The pig is therefore not an isolated exception in an otherwise unrestricted diet. It belongs to an extensive religious system governing what may be eaten and how food must be prepared.

Explaining that system solely as an ancient health code leaves out its central character as religious law.

3. The Jewish Separation of Meat and Dairy Begins With a Remarkably Short Command

The Torah repeats a command that sounds unusually specific: do not cook a young goat in its mother’s milk.

In traditional rabbinic Judaism, that wording provides the scriptural basis for a much broader separation of meat and dairy. Rabbinic interpretation understands the command’s three appearances as supporting prohibitions on cooking, eating, and deriving benefit from the meat-and-milk mixture covered by biblical law.

Further rabbinic rules extend the separation, including prohibiting poultry with dairy and eating meat and dairy together even when they were not cooked together. These distinctions matter because not every mixture has precisely the same legal status.

In everyday kosher practice, meat and dairy are kept separate, including through dedicated utensils and cookware and rules governing when one may be eaten after the other.

The biblical sentence itself does not supply the kind of explicit practical explanation a modern reader might expect.

What it does provide, within rabbinic tradition, is the foundation for a discipline that shapes ordinary meals.

A cheeseburger is not simply the wrong menu choice.

It crosses a boundary maintained throughout kosher life.

4. Sikhs Keep Their Hair Uncut for a Reason Bigger Than Appearance

One of the most recognizable elements of Sikh identity is kesh: uncut hair.

Keeping hair uncut is a Sikh religious ideal, and kesh is also one of the Five Ks required of initiated Sikhs. These articles of faith are associated with the Khalsa, the order founded by Guru Gobind Singh in 1699.

The other four are the kanga, a comb; kara, a steel bracelet; kachhera, prescribed shorts or undergarments; and kirpan, a religious article resembling a sword or knife. The kirpan carries an ethical responsibility associated with protecting others, not merely a decorative or ceremonial role.

Reducing kesh to “Sikhs aren’t allowed to get haircuts” misses its significance.

Sikh educational materials describe uncut hair as a gift from God and a sign of spirituality. Together with the other articles of faith, it expresses a commitment to Sikh values and identity.

The turban, worn by Sikh men and women, makes that commitment publicly visible. The Sikh Coalition describes it as an expression of values including service, compassion, and honesty.

Practice varies among individual Sikhs, but the religious ideal is more than a grooming rule.

It is a way of carrying commitment into public life.

5. Catholic Friday Abstinence Is About Penance, Not a Requirement to Eat Fish

You may have heard that Catholics eat fish on Fridays because a pope wanted to support fishermen or increase seafood sales.

That is not the religious explanation for Friday abstinence.

The U.S. Conference of Catholic Bishops identifies Friday as a special day of penance because it recalls Christ’s suffering and death. Giving up meat became a traditional way of marking that day through self-denial.

The current rules need a little precision. For Latin Church Catholics in the United States, abstinence from meat generally applies from age 14 on Ash Wednesday and the Fridays of Lent, including Good Friday. Fasting is required on Ash Wednesday and Good Friday for those ages 18 through 59, subject to applicable exemptions.

Friday retains its penitential character throughout the year. Outside Lent, U.S. Catholics may observe it through forms of penance other than abstaining from meat. Rules differ across countries, and Eastern Catholic Churches have their own disciplines.

And fish is not required.

A meal without meat or fish can satisfy the abstinence rule. The point is the penitential practice, not a command to order cod.

6. Many Hindus Avoid Beef, but “Hindus Worship Cows” Is Too Simple

The cow occupies a deeply revered place in many Hindu traditions. But that does not mean every Hindu regards every cow as a deity.

Cow veneration brings together religious symbolism, the animal’s role in sustaining human life, and a long history of changing attitudes toward killing and eating cattle. The cow has become associated with generosity and nourishment, while ahimsa—non-harm—has helped strengthen its significance as a symbol of nonviolent giving.

That history was not uniform from the beginning. Ancient Indian texts and practices include cattle sacrifice and meat consumption, alongside developing protections for cows, particularly milk-producing animals.

Over time, cow protection and beef avoidance became important features of many Hindu communities. But Hindu traditions remain diverse, and neither vegetarianism nor dietary practice is identical across all Hindus.

“Everyone worships cows” is therefore a poor explanation.

A better one is that many Hindus regard the cow as sacred and worthy of protection, making its slaughter and consumption religiously unacceptable.

7. Muslims Fast During Ramadan for More Than Hunger

During Ramadan, Muslims observing the fast abstain from food, drink, and sexual intercourse from dawn until sunset—not from sunrise. Quran 2:187 establishes the beginning of the fast at the appearance of dawn.

But describing Ramadan as “not eating during the day for a month” notices the outward practice without explaining its purpose.

The Quran identifies Ramadan as the month in which the Quran was revealed. It also describes fasting as a practice intended to cultivate taqwa, commonly expressed in English as piety or mindfulness of God.

Ramadan observance includes increased attention to prayer, charity, conduct, and spiritual discipline. Abstaining from food is part of a broader effort to live more attentively and faithfully.

The obligation also includes accommodations. The Quran explicitly addresses illness and travel, providing for missed days to be made up later, and discusses compensation through feeding a needy person in circumstances of extreme difficulty. Detailed application depends on the person’s circumstances and Islamic legal interpretation.

The hunger is real.

But hunger alone is not the goal.

8. Latter-day Saint Coffee and Tea Restrictions Aren’t a Blanket Ban on Caffeine

Members of The Church of Jesus Christ of Latter-day Saints are widely known for avoiding coffee and tea.

That has produced a common assumption: the religion bans caffeine.

The actual rule is more specific.

The Word of Wisdom, received by Joseph Smith in 1833 and recorded in Doctrine and Covenants Section 89, advises against substances including tobacco, “strong drinks,” and “hot drinks.” Church leaders have interpreted “hot drinks” as referring to coffee and tea.

The Church’s own historical explanation states that caffeine use is left to individual judgment and is not itself prohibited as a requirement for receiving a temple recommend.

The history also matters. The Word of Wisdom’s status as a binding religious requirement developed over time; the original revelation and its present-day enforcement should not be treated as identical historical moments.

This is a useful reminder that religious categories do not always match modern nutritional categories.

A caffeinated soft drink and a cup of coffee are not treated as equivalent simply because both contain caffeine.

9. Some Buddhist Monastics Avoid Eating After Noon—and It Isn’t a Diet Plan

In Theravada Buddhist monastic discipline, ordinary food is generally eaten between dawn and noon.

The restriction runs from noon until the following dawn. It comes from monastic rules, not from modern weight-loss advice.

“Monks don’t eat solid food after noon” is a convenient shorthand, but the rules are more technical than that. They distinguish ordinary food from certain permitted drinks and substances that may be used under specific conditions.

The practice belongs to a disciplined way of life rather than a general requirement that all Buddhists skip dinner. It also fits the traditional rhythm of monastic communities in which food is received from lay supporters, often during morning alms rounds.

The distinction is important.

This is not “Buddhists can’t eat dinner.”

It is a practice associated with particular forms of Buddhist monastic life.

10. Religious Practices Can Make an Invisible Commitment Visible

These examples do not all have the same explanation.

Avoiding pork in Islam rests on an explicit scriptural prohibition. Separating meat and dairy in rabbinic Judaism reflects scripture interpreted through religious law. Sikh articles of faith publicly express religious identity and ethical commitment. Catholic Friday penance connects a recurring practice with Christ’s death.

But together they suggest a broader way to understand religious rules.

Faith can be expressed not only through statements of belief but through repeated physical actions: choosing a meal, keeping hair uncut, setting aside particular times for fasting, or maintaining a separation between foods.

Those practices need not have identical origins—or mean exactly the same thing to every believer—to shape ordinary life.

What looks from outside like a small restriction may, from within the tradition, be a daily expression of belonging and commitment.

The Rule Is Usually Only Half the Story

It is easy to look at another religion’s rules and ask, “Why would anyone do that?”

A more useful question is: “What does this practice mean within the tradition that teaches it?”

Sometimes the answer begins with a command. Sometimes it requires understanding centuries of interpretation or historical change. And sometimes the outward practice tells you less than the commitment behind it.

You do not have to share a belief to understand why someone practices it.

But understanding requires more than spotting the restriction. It requires listening to the religious story that gives it meaning.

You may want to read:

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• Why Christianity Has Thousands of Denominations if Christians Follow the Same Bible