It was not leavened; both because leaven was forbidden to them at that time, and because the great haste required gave them not time for leavening it. They were thrust out of Egypt; not by force, but by importunate requests, as was observed on Exodus 12:33. Thus men are said to be driven to worship the sun, moon, &c., when they are persuaded to it, Deuteronomy 4:19.
Related Commentaries of Exodus 12:39
Exodus 12:39
39 And they baked unleavened cakes of the dough which they brought forth out of Egypt, for it was not leavened; because they were thrust out of Egypt, and could not tarry, neither had they prepared for themselves any victual.