²¹“Aaron and his sons must keep the lamps burning in the Tent of Meeting. The lamps will be outside the curtain that is in front of the tablets of the covenant. The lamps must be kept burning in my sight from evening until morning. That is a law for the people of Israel that will last for all time to come.

Clothes for the Priests

28“Have your brother Aaron brought to you from among the people of Israel. His sons Nadab, Abihu, Eleazar and Ithamar must also be brought. They will 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.