Exodus 12:37-42 - The Israelites Leave Egypt
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.
40 Now the time that the children of Israel lived in Egypt was four hundred thirty years. 41 It happened at the end of four hundred thirty years, even the same day it happened, that all the armies of Yahweh went out from the land of Egypt. 42 It is a night to be much observed to Yahweh for bringing them out from the land of Egypt. This is that night of Yahweh, to be much observed of all the children of Israel throughout their generations.