The word challah carries two meanings, and only one of them is a braided loaf. The older meaning is a portion - the piece of dough a Jewish woman tears from the batch before she shapes anything for the table. That torn-off piece does not go into the oven. It goes to fire, or to waste, or in Temple times to the kohen. It goes away first, and that is the point.
Hafrashat challah - the separation of challah dough - is listed in the Torah as a gift of the first of your dough (Numbers 15:20-21). The language is borrowed from the language of first-fruits: the first portion of the harvest that belongs not to the farmer but to what sustains the whole. In a land where grain was life, tearing away a piece before you had secured your own loaf was an act of trust. It said: I am not the first claimant on what I have made.
The record
The biblical source is Numbers 15:20-21: "Of the first of your dough you shall present a loaf as a contribution... throughout your generations." The Hebrew term used is challah (חַלָּה), meaning simply "a portion" or "cake." The Mishnah tractate Challah (tractate of the order Zeraim, c. 200 CE) codifies the minimum quantity requiring separation - one twenty-fourth of the batch for a home baker, one forty-eighth for a professional - and later halakhic practice fixes the blessing recited at the moment of separation. Later rabbinic tradition treats challah as one of the three mitzvot especially associated with women, alongside Shabbat candles and family purity.
When the Temple stood in Jerusalem, the portion went directly to a kohen, one of the priestly tribe who ate from the offerings in a state of ritual purity. When the Temple fell in 70 CE, most of the offerings became impossible. Challah dough separation did not. The rabbis ruled that the obligation persisted even in exile, but the portion - no longer receivable by a kohen in purity - must be burned. It became an act whose form was preserved even after its original destination had gone. A grandmother in Warsaw or Marrakesh or Aden tore off a piece of dough and held a lit match to it not because she was sending it to a priest but because she was keeping the form alive against the day it could be restored. That patient maintenance of gesture is one of the deep habits of Jewish life.
The record
The Shulchan Aruch (Yoreh De'ah 322-330), codified by Rabbi Yosef Karo and published in Safed in 1565, dedicates nine sections to the laws of hafrashat challah. It specifies which grains trigger the obligation (the five species: wheat, barley, spelt, oats, rye), the minimum dough volume (roughly 1.2 kg of flour in later halachic calculation), the blessing text, and the procedure for burning the portion in contemporary practice when no kohen is available to receive it. The Rema (Rabbi Moshe Isserles, 1572) adds Ashkenazi custom variants in his glosses to the same sections. The continuity from Mishnah to Shulchan Aruch to contemporary halacha is unbroken.
The blessing recited at hafrashat challah is short: "Blessed are You... who has commanded us to separate challah." Then the piece is torn away with the words "This is challah." What happens next - fire, prayer, quiet - matters less than the break in the act of making. Every loaf in that batch carries the memory of the piece that was given before the loaves existed. The same gesture connects a home baker today to every Jewish kitchen in which the same words were said, the same portion set aside, across three millennia of bread.
The braided Shabbat loaf borrowed its name from this older practice - the very word on the table is a reminder that the first thing dough does, in a Jewish kitchen, is give something away.
