²¹Aaron and his sons are to set up the lamp in the Tent of my presence outside the curtain which is in front of the Covenant Box. There in my presence it is to burn from evening until morning. This command is to be kept for ever by the Israelites and their descendants.

Garments for the Priests

28“Summon your brother Aaron and his sons, Nadab, Abihu, Eleazar, and Ithamar. Separate them from the people of Israel, so that they may serve me as priests.

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Exodus 27:21: In the tent of meeting, outside the veil that is before the testimony, Aaron and his sons shall tend it from evening to morning before the Lord. It shall be a statute forever to be observed throughout their generations by the people of Israel.