Exodus 12:39

With the dough they had brought from Egypt, they baked cakes of unleavened bread. The dough was without yeast because they had been driven out of Egypt and did not have time to prepare food for themselves.

(New International Version)

They baked the dough which they had brought out of Egypt into cakes of unleavened bread. For it had not become leavened, since they were driven out of Egypt and could not delay, nor had they prepared any provisions for themselves.

(New American Standard Bible)

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.

(King James Version)