Col 1:21-22, 2 Cor 5:17, Gal 5:24, Jn 17:17, Acts 26:18, Rom 15:16, 1 Cor 6:11, Heb 2:11, Heb 10:10
In the Old Testament, the holy God told the Israelites to become holy. (Lev 11:45)
Lev 11:45 For I am the Lord that bringeth you up out of the land of Egypt, to be your God: ye shall therefore be holy, for I am holy.
Christ Jesus sanctified us by dying on the cross for us. (Col 1:21-22, 2 Corinthians 5:17, Gal 5:24, John 17:17)
Col 1:21 And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled 22 In the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight:
2 Corinthians 5:17 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
Gal 5:24 And they that are Christ's have crucified the flesh with the affections and lusts.
John 17:17 Sanctify them through thy truth: thy word is truth.
If we believe in Jesus as the Christ, we are made holy. (Acts 26:18, Romans 15:16, 1 Corinthians 6:11, Hebrews 2:11, Hebrews 10:10)
Acts 26:18 To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.
Romans 15:16 That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God, that the offering up of the Gentiles might be acceptable, being sanctified by the Holy Ghost.
1 Corinthians 6:11 And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.
Hebrews 2:11 For both he that sanctifieth and they who are sanctified are all of one: for which cause he is not ashamed to call them brethren,
Hebrews 10:10 By the which will we are sanctified through the offering of the body of Jesus Christ once for all.