Exodus 12:43-47

And the Lord said to Moses and Aaron, “This is the ordinance of the Passover: no foreigner is to eat it;

but as for every slave that someone has purchased with money, after you have circumcised him, then he may eat it.

A stranger or a hired worker shall not eat it.

It is to be eaten in a single house; you are not to bring any of the meat outside of the house, nor are you to break any bone of it.

All the congregation of Israel are to celebrate this.