Exodus 12:43-47

The LORD said to Moses and Aaron, “This is the ordinance of the Passover: no foreigner is to eat of it; but every man’s slave purchased with money, after you have circumcised him, then he may eat of it. A sojourner or a hired servant shall not eat of it. It is to be eaten in a single house; you are not to bring forth any of the flesh outside of the house, nor are you to break any bone of it. All the congregation of Israel are to celebrate this.