Exodus 12:43-51

The LORD told Moses and Aaron, “Here are the rules for Passover: No foreigner is to eat the Passover. If someone buys a slave and circumcises him, the slave may eat the Passover. But neither a person who lives for a short time in your country nor a hired worker may eat it. “The meal must be eaten inside a house; take none of the meat outside the house. Don’t break any of the bones. The whole community of Israel must take part in this feast. A foreigner who lives with you may share in the LORD’s Passover if all the males in his house become circumcised. Then, since he will be like a citizen of Israel, he may share in the meal. But a man who is not circumcised may not eat the Passover meal. The same rules apply to an Israelite born in the country or to a foreigner living there.” So all the Israelites did just as the LORD had commanded Moses and Aaron. On that same day the LORD led the Israelites out of Egypt by their divisions.