Exodus 12:48-50

New International Version - UK

⁴⁸ ‘A foreigner residing among you who wants to celebrate the Lord’s Passover must have all the males in his household circumcised; then he may take part like one born in the land. No uncircumcised male may eat it. ⁴⁹ The same law applies both to the native-born and to the foreigner residing among you.’

⁵⁰ All the Israelites did just what the Lord had commanded Moses and Aaron.