God is holy
"For He who is mighty has done great things for me, And holy is His name." (Luke 1:49, NKJV).
Jesus calls God "Holy Father" (John 17:11, NKJV).
God is holy and wants a holy people: "because it is written, "Be holy, for I am holy." (1 Peter 1:16, NKJV). Jesus Christ sanctifies.
Anyone who goes through the water baptism and the baptism of the Holy Spirit is sanctified:
And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God. (1 Corinthians 6:11, NKJV)