Ezekiel 44:4-9 - Rules For Admission To The Temple
4 Then he brought me by way of the north gate to the front of the house: and I looked, and, behold, the glory of the LORD filled the house of the LORD: and I fell upon my face. 5 And the LORD said unto me, Son of man, mark well, and behold with your eyes, and hear with your ears all that I say unto you concerning all the ordinances of the house of the LORD, and all its laws; and mark well those who may enter the house, going out from the sanctuary.
6 And you shall say to the rebellious, even to the house of Israel, Thus says the Lord GOD; O you house of Israel, let there be an end of all your abominations, 7 In that you have brought into my sanctuary foreigners, uncircumcised in heart, and uncircumcised in flesh, to be in my sanctuary, to pollute it, even my house, when you offer my food, the fat and the blood, and they have broken my covenant because of all your abominations. 8 And you have not kept charge of my holy things: but you have set others as keepers of my charge in my sanctuary instead of yourselves.
9 Thus says the Lord GOD; No foreigner, uncircumcised in heart, nor uncircumcised in flesh, shall enter into my sanctuary, of any foreigner that is among the children of Israel.