Exodus 12:48-50

International Standard Version

⁴⁸ If an alien who resides with you wants to observe the Passover to the Lord, every male in his household^[a] must be circumcised, and then he may come near to observe it. He is to be like a native of the land, but no uncircumcised person is to eat it. ⁴⁹ A single law exists for the native and the alien who resides among you.”

⁵⁰ All the Israelis did this. They did exactly as the Lord commanded Moses and Aaron.