Exodus 12:46-48

New Revised Standard Version, Anglicised Catholic Edition

⁴⁶ It shall be eaten in one house; you shall not take any of the animal outside the house, and you shall not break any of its bones. ⁴⁷ The whole congregation of Israel shall celebrate it. ⁴⁸ If an alien who resides with you wants to celebrate the passover to the Lord, all his males shall be circumcised; then he may draw near to celebrate it; he shall be regarded as a native of the land. But no uncircumcised person shall eat of it;