Ezekiel 44:4-9 - Rules For Admission To The Temple
4 Then he brought me toward the north gate in 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, pay attention, and behold with thine eyes and hear with thine ears all that I say unto thee concerning all the ordinances of the house of the LORD and all its laws; and pay attention to the entering in of the house and to every going forth from the sanctuary.
6 And thou shalt say to the rebellious, even to the house of Israel, Thus hath the Lord GOD said: O ye house of Israel, let all your abominations cease. 7 In that ye have brought into my sanctuary strangers, uncircumcised in heart and uncircumcised in flesh to be in my sanctuary to pollute it, even my house, when ye offer my bread, the fat and the blood, and they have broken my covenant because of all your abominations. 8 And ye have not kept the charge of my holy things; but ye have set keepers of my charge in my sanctuary for yourselves.
9 Thus hath the Lord GOD said; No son of a stranger, uncircumcised in heart nor uncircumcised in flesh shall enter into my sanctuary, of any sons of strangers that are among the sons of Israel.