All minchah-offerings are brought as matzah except for the leavened [bread] of the todah-offering and the shtei halechem, which are brought leavened. R’ Meir says: He abstracts sourdough for them from within themselves and leavens them. R’ Yehudah says: This, too, is not preferred. Rather, he brings sourdough, places it within the measure, and then fills the measure. They said to him: This, too, would be deficient or excessive.