Exodus 12:37-39
37
The children of Israel traveled from Rameses to Succoth, about six hundred thousand on foot who were men, besides children.
38
A mixed multitude went up also with them, with flocks, herds, and even very much livestock.
39
They baked unleavened cakes of the dough which they brought forth out of Egypt; for it wasn't leavened, because they were thrust out of Egypt, and couldn't wait, neither had they prepared for themselves any food.