Rif Pesachim 15b {Pesachim 48b continues; 48a; 49a}

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15b

{Pesachim 48b}
in the dough, it does not come to become chametz.

{Pesachim 48a}
Rav said: a kav of Meloga {=a place in Bavel} for Pesach {=one must not knead more dough than that}, and so for {the imposition of the obligation of} challah.
But we have learned {Pesachim 48b}: a bit more than 5/4ths {of a kav} are subject to challah.
This is what it means to say: a kav of Meloga is equivalent to this measure.

Rav Yosef said: And these women of ours are accustomed to bake a kepiza {=3/4 of a kav} at a time on Pesach.
Abaye said to him: What are your thoughts here? As a stringency? This is a stringency which brings to a leniency, for they are thus removing it from the obligation of challah!
{A reply: Our gemara has אמר ליה:} For they conduct themselves like Rabbi Eliezer.

For they learnt {in a brayta}: Rabbi Eliezer says: Even one who shovels {bread out of an oven} and places them into a basket, the basket combines them to {the obligation of} challah, for it is written {Bemidbar 15:19-20}:

ט וְהָיָה, בַּאֲכָלְכֶם מִלֶּחֶם הָאָרֶץ--תָּרִימוּ תְרוּמָה, לַה.	19 then it shall be, that, when ye eat of the bread of the land, ye shall set apart a portion for a gift unto the LORD.
כ רֵאשִׁית, עֲרִסֹתֵכֶם--חַלָּה, תָּרִימוּ תְרוּמָה: כִּתְרוּמַת גֹּרֶן, כֵּן תָּרִימוּ אֹתָהּ.	20 Of the first of your dough ye shall set apart a cake for a gift; as that which is set apart of the threshing-floor, so shall ye set it apart.

And Rav Yehuda cited Shmuel: The halacha is like Rabbi Eliezer.
He {Abaye} said to him {Rav Yosef}: But we state upon this: Rabbi Yehoshua ben Levi said: they only learned this regarding loaves which stick one to the other, but pronged no.
{A response - Rav Yosef's response:} We state upon this: Rabbi Chanina said: Even pronged.

Mishna:
si`ur must be burnt, and one who eats it is exempt.
siduk must be burnt, and one who eats it is liable to karet.
What {level of fermentation} is si`ur? {When there are lines on the surface} like locust horns {=small lines just beginning to appear}.
What is siduk? When the cracks have intermingled with each other.
These are the words of Rabbi Yehuda.
And the Sages say: This and that {situations defined by Rabbi Yehuda}, one who eats it is liable to karet.
What is si`ur {for which one is exempt}? When its surface is blanched like {the face of} a man whose hair is standing on end.

Gemara:
This that the Mishna teaches "And the Sages say: This and that one who eats it is liable to karet" is taught in the Tosefta in the name of Rabbi Meir. And even so, the halacha is like him, for they teach it in the Mishna with the term "Sages."
Rava said: What is the reason of Rabbi Meir? There is not a single crack on the surface that does not have many cracks below {the surface}.

{Pesachim 49a}
Mishna:
If the 14th fell on a Shabbat, they remove it all {=the chametz} before Shabbat. These are the words of Rabbi Meir. And the Sages say: in its time. Rabbi Eleazar bar Tzadok says: Terumah before Shabbat and non-holy in its time.

Gemara:
They learnt {in a brayta}: One time my father spent a week in Yavneh, {the seat of Rabbi Yochanan ben Zakai's academy and the Sanhedrin after the destruction of Yerushalayim} and the 14th