Exodus 12:44-48

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.

But if a stranger resides with you and celebrates the Passover to the Lord, all of his males are to be circumcised, and then he shall come near to celebrate it; and he shall be like a native of the land. But no uncircumcised male may eat it.