Leviticus 21:23

¹²He shall not go out of the sanctuary, nor profane the sanctuary of his God; for the crown of the anointing oil of his God is upon him. I am the LORD.

²⁶He put the golden altar in the Tent of Meeting before the veil; ²⁷and he burned incense of sweet spices on it, as the LORD commanded Moses.

³¹“‘Thus you shall separate the children of Israel from their uncleanness, so they will not die in their uncleanness when they defile my tabernacle that is among them.’”

⁹The Lord GOD says, “No foreigner, uncircumcised in heart and uncircumcised in flesh, shall enter into my sanctuary, of any foreigners who are among the children of Israel.

¹⁰“‘“But the Levites who went far from me when Israel went astray, who went astray from me after their idols, they will bear their iniquity. ¹¹Yet they shall be ministers in my sanctuary, having oversight at the gates of the house, and ministering in the house. They shall kill the burnt offering and the sacrifice for the people, and they shall stand before them to minister to them. ¹²Because they ministered to them before their idols, and became a stumbling block of iniquity to the house of Israel, therefore I have lifted up my hand against them,” says the Lord GOD, “and they will bear their iniquity. ¹³They shall not come near to me, to execute the office of priest to me, nor to come near to any of my holy things, to the things that are most holy; but they will bear their shame and their abominations which they have committed. ¹⁴Yet I will make them performers of the duty of the house, for all its service and for all that will be done therein.

⁶You shall put it before the veil that is by the ark of the covenant, before the mercy seat that is over the covenant, where I will meet with you. ⁷Aaron shall burn incense of sweet spices on it every morning. When he tends the lamps, he shall burn it. ⁸When Aaron lights the lamps at evening, he shall burn it, a perpetual incense before the LORD throughout your generations.