²¹The lampstand will stand in the Tabernacle, in front of the inner curtain that shields the Ark of the Covenant. Aaron and his sons must keep the lamps burning in the Lord’s presence all night. This is a permanent law for the people of Israel, and it must be observed from generation to generation.

Chapter 28 Clothing for the Priests

“Call for your brother, Aaron, and his sons, Nadab, Abihu, Eleazar, and Ithamar. Set them apart from the rest of the people of Israel so they may minister to me and be my 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.