Translation:Shulchan Aruch/Yoreh Deah/324

Seif 13: Dough that doesn’t have in it a שיעור-measure, but at the time of its baking, it rises and grows until it appears as if it has a שיעור-measure, it is exempt. {Rema: And the law is the same if it rises before baking}

Seif 14: A person is forbidden to make his dough less than the שיעור-measure in order to exempt himself from the obligation [to take] challah.