Exodus 12:37-40

37Then the children of Israel journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides children.

38A mixed multitude went up with them also, and flocks and herds—a great deal of livestock.

39And they baked unleavened cakes of the dough which they had brought out of Egypt; for it was not leavened, because they were driven out of Egypt and could not wait, nor had they prepared provisions for themselves.

40Now the sojourn of the children of Israel who lived in Egypt was four hundred and thirty years.