And he poured of the anointing oil upon Aaron's head, and anointed him, to sanctify him.
All Commentaries on Leviticus 8:12 Go To Leviticus 8
Cyril of Jerusalem
AD 386
You must know that this chrism [chrismation] is prefigured in the Old Testament. When Moses, conferring on his brother the divine appointment, was ordering him high priest, he anointed him after he had bathed in water, and thenceforward he was called “christ” [“anointed”], clearly after the figurative Chrism.