Exodus 12:37-42

37And the children of Israel journeyed from Rameses to Succoth, about six hundred thousand on foot that were men, besides children. 38And a mixed multitude went up also with them; and flocks, and herds, even very many cattle.1 39And they baked unleavened cakes of the dough which they brought from Egypt, for it was not leavened; because they were driven from Egypt, and could not tarry, neither had they prepared for themselves any food. 40Now the sojourning of the children of Israel, who dwelt in Egypt, was four hundred and thirty years. 41And it came to pass at the end of the four hundred and thirty years, even the same day it came to pass, that all the hosts of the LORD departed from the land of Egypt. 42It is a night to be much observed to the LORD for bringing them out from the land of Egypt: this is that night of the LORD to be observed by all the children of Israel in their generations.2