Why Is It Called Kosher? The Word's Origins Across Three Faiths

The word kosher derives from the Hebrew root kasher (כָּשֵׁר), meaning "fit," "proper," or "correct." It's not a word that appears in the Torah with that exact dietary meaning in every passage, but the concept of ritual fitness permeates the Levitical code. Priests, for instance, were commanded to be holy and not to profane God's name precisely because they handled the sacred offerings and bread Leviticus 21:6. That same logic of "fitness for sacred purpose" extended over centuries of rabbinic development into the full body of kashrut law.

Rabbinic authorities — notably Maimonides in his 12th-century Mishneh Torah and later Joseph Karo in the 16th-century Shulchan Aruch — codified what makes food kosher: permitted animal species, ritual slaughter (shechita), prohibition on blood, and separation of meat and dairy. The term kasher thus evolved from a general Hebrew adjective meaning "fit" into a technical legal designation. It's worth noting that scholars like Jacob Milgrom have argued the dietary laws are fundamentally about holiness and boundary-marking for the Israelite community, not hygiene — a point still debated today.

The bitter waters at Marah Exodus 15:23 and the naming of places like Eshcol Numbers 13:24 illustrate how central the act of naming and designating things was in Israelite culture — calling something by a fitting name was itself a theological act. Calling food kosher is, in that sense, a continuation of that ancient Hebrew practice of naming things according to their essential character.

Christianity inherited the Hebrew scriptures and thus the word and concept of kosher, but most Christian traditions hold that the Mosaic dietary laws were fulfilled or set aside through Christ's ministry. The New Testament records debates about food purity, and the early church — particularly in Paul's letters — generally concluded that no food is inherently unclean. The Passover feast itself, referenced in Luke as "the feast of unleavened bread" Luke 22:1, became reinterpreted in Christian theology as a foreshadowing of the Eucharist rather than an ongoing dietary obligation.

Mainstream Christian denominations — Catholic, Orthodox, and most Protestant — don't observe kosher laws, though some groups like Seventh-day Adventists maintain modified dietary restrictions. The word kosher is recognized in Christian contexts primarily as a Jewish term, and theologians like N.T. Wright have argued that the abolition of food laws was a deliberate theological statement about the inclusion of Gentiles in the covenant community. There's genuine disagreement among scholars about whether early Jewish Christians continued kosher observance, and some Messianic Jewish communities today maintain that they do.

Islam doesn't use the word kosher — its parallel concept is halal (حَلَال), meaning "permissible" in Arabic. However, Islamic tradition explicitly recognizes the Jewish dietary laws as having a shared Abrahamic origin, and the Quran acknowledges that certain foods were forbidden to the Children of Israel. The Quran in Surah As-Saffat (Chapter 37) addresses the believing community in terms of those who "line up in rows" in devotion Quran 37:1, reflecting the broader Islamic emphasis on ordered, disciplined submission to divine command — a spirit that underlies both halal and kosher frameworks.

Islamic jurisprudence, developed by scholars like al-Nawawi in the 13th century, permits Muslims to eat food slaughtered by Jews and Christians ("People of the Book") under certain conditions, which means kosher meat has historically been considered acceptable by many Muslim scholars. However, there are disagreements: some contemporary scholars argue that modern industrial kosher certification doesn't meet halal standards, particularly regarding stunning of animals and the pronunciation of God's name. The Quran's repeated emphasis on what is "clearly" permissible or forbidden Quran 37:15 mirrors the Jewish concern for clear categorical designation that gave rise to the word kosher itself.