Exodus 27:21

27:21 In the tent of meeting ¹  outside the curtain that is before the testimony, Aaron and his sons are to arrange it from evening ²  to morning before the Lord. This is to be a lasting ordinance among the Israelites for generations to come. ³ 

Exodus 29:21

29:21 You are to take some of the blood that is on the altar and some of the anointing oil and sprinkle it ⁴  on Aaron, on his garments, on his sons, and on his sons’ garments with him, so that he may be holy, ⁵  he and his garments along with his sons and his sons’ garments.

¹ tn The LXX has mistakenly rendered this name “the tent of the testimony.”

² sn The lamps were to be removed in the morning so that the wicks could be trimmed and the oil replenished (30:7) and then lit every evening to burn through the night.

³ sn This is the first of several sections of priestly duties. The point is a simple one here: those who lead the worship use the offerings of the people to ensure that access to God is illumined regularly. The NT will make much of the symbolism of light.

⁴ tn Here “it” has been supplied.

⁵ tn The verb in this instance is Qal and not Piel, “to be holy” rather than “sanctify.” The result of all this ritual is that Aaron and his sons will be set aside and distinct in their life and their service.