Pesahim 48a and Pesahim 48b, finishing up ho’il, bringing it back to the debate between R. Eliezer and R. Yehoshua about what to do about hallah that was ritually impure on Pesah, then discussions of how to bake doughs in lesser amounts than are obligated in hallah, and yet to find a way to give the hallah after baking. From there to how we bake doughs to be sure they do not become leavened, and a debate about what qualifies as leavened.
