8 and doth put on him the breastplate, and doth put unto the breastplate the Lights and the Perfections, 9 and doth put the mitre on his head, and doth put on the mitre, over-against its front, the golden flower of the holy crown, as Jehovah hath commanded Moses. 10 And Moses taketh the anointing oil, and anointeth the tabernacle, and all that 'is' in it, and sanctifieth them; 11 and he sprinkleth of it on the altar seven times, and anointeth the altar, and all its vessels, and the laver, and its base, to sanctify them; 12 and he poureth of the anointing oil on the head of Aaron, and anointeth him to sanctify him.
Matthew Henry's Commentary on Leviticus 8:8-12
Commentary on Leviticus 8:1-13
(Read Leviticus 8:1-13)
The consecration of Aaron and his sons had been delayed until the tabernacle had been prepared, and the laws of the sacrifices given. Aaron and his sons were washed with water, to signify that they ought to purify themselves from all sinful dispositions, and ever after to keep themselves pure. Christ washes those from their sins in his own blood whom he makes kings and priests to our God, Hebrews 10:22. The anointing of Aaron was to typify the anointing of Christ with the Spirit, which was not given by measure to him. All believers have received the anointing.