What is the role of the anointing of the priests in the Old Testament and the Myron (Chrism) oil in the New Testament?

The very first time that anointing people was used in the history of salvation was the anointing of priests; Aaron and his children (Ex. 29:7). As a high priest in the Old Testament, Aaron had to commit to always place on his forehead the plate of pure gold which had the words, “Holiness to the Lord,” engraved on it so that the people may be accepted before the Lord (Ex. 28:36–38). This was a symbol of the heavenly High Priest, our Lord Jesus (Rom. 8:34). At the same time, he was not permitted to enter the Holy of Holies except once every year, and only after offering sacrifices on behalf of himself and the people (Lev. 16:34; Heb. 9:7).

As for us, we have become priests of the Lord in Christ Jesus, who grants us His righteousness as a plate on our foreheads, minds, senses, and all the faculties of our bodies, souls, and spirits. Therefore, we offer our prayers and worship since we have put on Christ as Scripture says: “Who is he who condemns? It is Christ who died, and furthermore is also risen, who is even at the right hand of God, who also makes intercession for us” (Rom. 8:34); “Therefore, He is also able to save to the uttermost those who come to God through Him, since He always lives to make intercession for them” (Heb. 7:25); “And has made us kings and priests to His God and Father, to Him be glory and dominion forever and ever, Amen” (Rev. 1:6); “And have made us kings and priests to our God, and we shall reign on the earth” (Rev. 5:10); and “Blessed and holy is he who has part in the first resurrection. Over such the second death has no power, but they shall be priests of God and of Christ and shall reign with Him a thousand years” (Rev. 20:6).

We will discuss, God willing, in detail the difference between the general priesthood and the sacrament of priesthood, in the section on the “Sacrament of Priesthood.”