How do we separate challah from contaminated dough on the festival?  R' Eliezer says: She should not designate it with the name [challah] until it is baked. R' Yehudah ben Beseira says: Let it be cast into cold water.  Said R' Yehoshua: This is not the leaven concerning which we are warned, It shall not be seen (Exodus 13:7) and It shall not be found (Exodus 12:19). But he separates it and leaves it until the evening; and if it leavens, it leavens.

Rabban Gamliel says: Three women may knead at the same time and bake in the same oven, one after the other. But the Sages say: Three women may be occupied with dough [simultaneously]: one kneads, another shapes, and a third bakes.  R' Akiva says: Not all women and not all kinds of wood and not all ovens are alike.  This is the general rule: If [the dough] rises let her wet it with cold water.

Partly leavened dough must be burned, but one who eats it is exempt [from punishment]. Furrowed dough must be burned and one who eats it is liable to kares.  Which [dough] is [classified as] “partly leavened”? — [When the furrows are] like locusts' horns. [Which is classified as] “furrowed”? — When the furrows run into each other —- [these are] the words of R' Yehudah.  But the Sages say: [If] one eats either of these he is liable to kares. [If so,] which is “partly leavened dough”? — Whenever its surface turns pallid, like [that of] a man whose hairs stand on end.

[If] the fourteenth [of Nissan] falls on the Sabbath, we remove everything before the Sabbath —- [these are] the words of R' Meir.  But the Sages say: [Everything is removed] at its [usual] time;  R' Elazer bar Tzadok says: Terumah [must be removed] before the Sabbath and chullin at its [usual] time.