Exodus 12:38-39

38A 1mixed multitude also went up with them, 2along with flocks and herds, a 3very large number of livestock. 39They baked the dough which they had brought out of Egypt into cakes of unleavened bread. For it had not become leavened, since they were 4driven out of Egypt and could not delay, nor had they 5prepared any provisions for themselves.