“These are the animals you may eat of all the beasts on the earth: whatever has a completely divided hoof and chews the cud, that you may eat.” (Leviticus 11:2-3)
No chapter of the Bible deals with the menu in such detail as Leviticus 11. God gives Israel a well-thought-out system: clean and unclean. No arbitrariness, but an order that sets Israel apart from the nations. Whoever wants to understand why Jews do not eat pork must start here.
The Criteria: Clear, Not Complicated
The system is astonishingly simple. Two main categories, two marks per category:
- Land animals: chewing the cud AND completely divided hooves. Both must apply. The camel chews the cud but has no divided hooves, therefore unclean. The pig has divided hooves but does not chew the cud, therefore unclean. Cattle, sheep, goat: both marks, clean.
- Water animals: fins AND scales. If one is missing, unclean. Eels have fins but no visible scales. Shellfish, mussels, squid have neither and fall off the menu. Carp, perch: clean.
Added to this are rules for birds (birds of prey and carrion eaters are unclean), insects (only the locust kind) and crawling creatures (unclean as a whole). The system follows an inner logic that today we can trace only in outline.
The Why: An Honest Answer
The most frequently asked question about Leviticus 11 is: why? The honest answer: the text does not say. The Torah does not justify the dietary laws medically. It explains them with holiness: “You shall be holy, for I am holy” (Leviticus 11:44). It is about being set apart, about identity, about the otherness of Israel. The dietary laws are part of a larger purity system that spans worship, body and everyday life. Whoever looks for a hygienic master plan is looking in the wrong place.
Even so, the hygiene thesis persists stubbornly: God gave the dietary laws to protect against disease. This thesis does not come from the Bible. It goes back to the American physician S.I. McMillen, who spread it in 1963 in his book “None of These Diseases”, without a controlled study. A well-meant but scientifically unsupported apologetic, passed on ever since as seemingly established knowledge.
We separate cleanly: one thing is the biblical reason (holiness and being set apart), the other a popular but unproven additional thesis. That some forbidden animals can carry risks (trichinae in pork, toxins in filter feeders) is a side effect, not the purpose. No promises of healing. Only the text and what it says.
Its Place in the Arc: Eden, Flood, Moses
The dietary laws do not stand alone. They are the third step in the biblical arc of food:
- Eden (Gen 1:29): The original. Purely plant-based. No animal dies for the plate.
- After the Flood (Gen 9:3): God permits meat, with the prohibition of blood as the first boundary. A concession, not an ideal.
- Dietary laws (Leviticus 11): The permission to eat meat is fine-tuned. Only animals that meet God’s criteria of order are now allowed.
- Peter on the Rooftop (Acts 10): God declares all animals clean. The next step.
This arc is growing differentiation and, finally, liberation. The dietary laws are not an endpoint but a station along the way.
Wisdom, not law
For Christians in the New Covenant, the dietary laws are no longer a regulation. Jesus made it clear: it is not the food that makes unclean, but the heart (Mark 7:15). The apostles’ assembly in Jerusalem did not impose the catalogue of Leviticus 11 on non-Jews, only the bare essentials (Acts 15:20). Paul wrote: everything created is good, and nothing is to be rejected if it is received with thanksgiving (1 Tim 4:4).
That is why we read Leviticus 11 not as law but as wisdom that extends an invitation: eat consciously, do not consume thoughtlessly. The question “What is clean?” teaches attention. In that, it remains current.
Digging Deeper: Three Open Questions
The dietary laws raise more questions than one page can answer. Three of them deserve their own deep dives:
- Why the pig, of all animals? Among all the forbidden animals, the pig became the symbol. Yet it is only one of many unclean animals. What made it the cultural marker that distinguishes Jews from their surroundings to this day?
- Shellfish and filter feeders. Mussels, oysters, shrimp: of all creatures, the very ones that filter and clean the water are themselves unclean. A connection the Torah hints at without spelling it out.
- The prohibition of blood. Already in Noah’s day the rule stood: blood must not be eaten (Gen 9:4). This prohibition is older than Moses and runs through all of Scripture. What lies behind it?
These deep dives will appear one by one.
Continuing the Arc
The dietary laws were never the last word. Around a thousand years after Moses, Peter stands on a rooftop in Joppa: a sheet full of animals, clean and unclean. God’s voice says: “What God has declared clean, you must not call unclean” (Acts 10:15). The arc continues, toward freedom.