What Is It to Be Kosher? A Three-Faith Comparison

In Judaism, being kosher — from the Hebrew kasher, meaning "fit" or "proper" — is a comprehensive system of laws governing what foods may be eaten, how animals must be slaughtered, and how food must be prepared and served. These laws derive primarily from the Torah, particularly Leviticus and Exodus. The Torah commands the Israelites to be holy men set apart for God, and part of that holiness is expressed through what they eat Exodus 22:31. Flesh torn by wild animals in the field, for example, is explicitly forbidden — it must be cast to the dogs Exodus 22:31.

The priestly class bore an especially heightened obligation: they were to be holy unto their God and not profane His name, since they offered the fire-offerings and the bread of God Leviticus 21:6. Scholars such as Jacob Milgrom (in his 1991 Leviticus commentary) have argued that the kosher laws functioned as a daily, embodied reminder of Israel's covenant identity. The entire congregation of Israel was expected to observe these ordinances together Exodus 12:47, making kashrut a communal as well as individual practice.

Key kosher categories include permitted animals (those that chew the cud and have split hooves), forbidden animals (pork, shellfish, birds of prey), the prohibition of mixing meat and dairy, and the requirement of ritual slaughter (shechita). Rabbinic tradition expanded these biblical foundations substantially, and today Orthodox, Conservative, and Reform communities disagree on how strictly to apply them — a live internal debate that has persisted for centuries.

Christianity's relationship to kosher law is complex and historically contested. Early Jewish followers of Jesus observed Torah food laws, but the Pauline epistles and the Council of Jerusalem (Acts 15, c. 50 CE) largely released Gentile believers from these obligations. Most Christian traditions today do not observe kosher laws, viewing them as part of the Mosaic covenant that was fulfilled or superseded in Christ. That said, the call to holiness remains central: Paul urges believers to cleanse themselves "from all filthiness of the flesh and spirit, perfecting holiness in the fear of God" 2 Corinthians 7:1.

For mainstream Christianity, purity is primarily a matter of the heart and spirit rather than dietary regulation. Theologians like N.T. Wright have emphasized that the early church's move away from food laws was a deliberate theological statement about the inclusion of Gentiles into God's people. Some Christian communities — notably Seventh-day Adventists and certain Messianic Jewish congregations — do voluntarily observe kosher or kosher-adjacent dietary principles, citing both health and continuity with Scripture.

Islam does not use the term "kosher" but has its own parallel framework called halal (lawful) and haram (forbidden). Like the Jewish kosher system, Islamic dietary law forbids pork, blood, and animals not slaughtered in the proper manner with the name of God invoked. The Quran repeatedly calls believers to righteousness and proper conduct before God Quran 37:1, and the concept of spiritual and ritual fitness permeates Islamic practice much as kashrut does in Judaism.

Islamic scholars generally hold that kosher meat slaughtered by Jews is permissible for Muslims to eat under certain conditions — a ruling found in classical fiqh literature — though contemporary scholars like Yusuf al-Qaradawi have nuanced this based on modern industrial slaughter practices. The Quran's emphasis on those who are morally upright and fit before God Quran 37:163 resonates with the broader Abrahamic idea that holiness encompasses both action and intention. Halal certification today functions in Muslim-majority and minority communities much as kosher certification does in Jewish ones.