Exodus 12:37-40

37Now the Israelites journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides [the women and] the children.

38A mixed multitude [of non-Israelites from foreign nations] also went with them, along with both flocks and herds, a very large number of livestock.

39And they baked unleavened cakes of the dough which they brought from Egypt; it was not leavened, since they were driven [quickly] from Egypt and could not delay, nor had they prepared any food for themselves.

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