Ezekiel 44:7, 9

In addition to all your other detestable practices, you brought foreigners uncircumcised in heart and flesh into my sanctuary, desecrating my temple while you offered me food, fat and blood, and you broke my covenant.

This is what the Sovereign LORD says: No foreigner uncircumcised in heart and flesh is to enter my sanctuary, not even the foreigners who live among the Israelites.