Exodus 12:44-48

44If you buy a foreign slave, you must first circumcise him. Then he may eat the food.

45But if you pay him money for his work, he must not eat the food. A visitor also must not eat the food.

46You must eat the meal in one house. You must not take any of the meat outside the house. You must not break any of the bones in the meat.

47All the Israelites must enjoy the feast together.

48There may be a foreign person who lives among you. He may want to join you to eat the Lord's Passover meal. But he must first be circumcised as well as all the men in his house. Then he can join with you and eat the Passover meal. He will be like a man who has been born in Israel. But no male person without circumcision can join the Passover feast.