Ezekiel 44:7, 9

in admitting foreigners, uncircumcised in heart and flesh, to be in my sanctuary, profaning my temple, when you offer to me my food, the fat and the blood. You have broken my covenant, in addition to all your abominations.

“Thus says the Lord GOD: No foreigner, uncircumcised in heart and flesh, of all the foreigners who are among the people of Israel, shall enter my sanctuary.