Exodus 12:37-51

Now the Israelites journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides [the women and] the children. A mixed multitude [of non-Israelites from foreign nations] also went with them, along with both flocks and herds, a very large number of livestock. [Num 11:4; Deut 29:11] And 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. Now the period of time the children of Israel lived in Egypt was four hundred and thirty years. [Gen 15:13, 14] At the end of the four hundred and thirty years, to that very day, all the hosts of the LORD [gathered into tribal armies] left the land of Egypt. It is a night of watching to be observed for the LORD for having brought them out of the land of Egypt; this [same] night is for the LORD, to be observed and celebrated by all the Israelites throughout their generations. The LORD said to Moses and Aaron, “This is the ordinance of the Passover: no foreigner is to eat it; but every man’s slave who is bought with money, after you have circumcised him, then he may eat it. No stranger (temporary resident, foreigner) or hired servant shall eat it. It is to be eaten inside one house; you shall not take any of the meat outside the house, nor shall you break any of its bones. [John 19:33, 36] The entire congregation of Israel shall keep and celebrate it. If a stranger living temporarily among you wishes to celebrate the Passover to the LORD, all his males must be circumcised, and then he may participate and celebrate it like one that is born in the land. But no uncircumcised person may eat it. The same law shall apply to the native-born and to the stranger who lives temporarily among you.” Then all the Israelites did so; they did just as the LORD had commanded Moses and Aaron. And on that very same day the LORD brought the Israelites out of the land of Egypt by their hosts (tribal armies).