Anyway, I am including some information from Wikipedia on the history of chrism.
Multiple early Christian documents discuss the "ordinance" or "several
The most detailed version of the practice is by Cyril of Jerusalem who details how ointment or oil was "symbolically applied to the forehead, and the other organs of sense" and that the "ears, nostrils, and breast were each to be anointed." Cyril states that the "ointment is the seal of the covenants" of baptism and God’s promises to the Christian who is anointed. Cyril taught that being "anointed with the Holy anointing oil [Chrism] of God" was the sign of a Christian (Christos means "anointed"), and a physical representation of having the Gift of the Holy Spirit (Holy Ghost), and it retains this meaning in Catholicism and Orthodoxy today. He says, "Having been counted worthy of this Holy Chrism, ye are called Christians, verifying the name also by your new birth. For before you were deemed worthy of this grace, ye had properly no right to this title, but were advancing on your way towards being Christians."(On the Mysteries 3.5)