2 Corinthians 1:21-22
But the one who gives us security (Vulgate,
confirms) with you in Christ and who anointed us is God;
he has also
put his seal upon us and given the Spirit
in our hearts
as a first installment.
In these words, the great Fathers and Doctors of the Church
and believers from Apostolic times have seen that sacrament
so designated by which the Holy Spirit is confirmed.
From this scripture the sacrament was variously known as
"confirmation," "signing," "anointing."