Exodus 12:37-42

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

38A mixed multitude also went up with them, and very much livestock, both flocks and herds.

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

40The time that the people of Israel lived in Egypt was 430 years.

41At the end of 430 years, on that very day, all the hosts of the Lord went out from the land of Egypt.

42It was a night of watching by the Lord, to bring them out of the land of Egypt; so this same night is a night of watching kept to the Lord by all the people of Israel throughout their generations.