Rom 12:2 And do not be conformed to this world, but be transformed by the renewing of your mind, in order to prove by you what is that good and pleasing and perfect will of God.

The progress of sanctification, dying to sin more and more, and living to righteousness more and more, is the carrying on this renewing work, till it is perfected in glory. The great enemy to this renewal is, conformity to this world.... The work of the Holy Ghost first begins in the understanding, and is carried on to the will, affections, and conversation, till there is a change of the whole man into the likeness of God, in knowledge, righteousness, and true holiness.

The root is found in the Old Testament in the Hebrew verb ḳādhash, in the New Testament in the Greek verb, hagoázō. The noun “sanctification” (hagiasmós) does not occur in the Old Testament and is found but 10 times in the New Testament, but the roots noted above appear in a group of important words which are of very frequent occurrence. These words are “holy,” “hallow,” “hallowed,” “holiness,” “consecrate,” “saint,” “sanctify,” “sanctification.” By sanctification is ordinarily meant that hallowing of the Christian believer by which he is freed from sin and enabled to realize the will of God in his life. This is not, however, the first or common meaning in the Scriptures. To sanctify means commonly to make holy, that is, to separate from the world and consecrate to God.
1. In the Old Testament:To understand this primary meaning we must go back to the word “holy” in the Old Testament. That is holy which belongs to Yahweh. There is nothing implied here as to moral character. It may refer to days and seasons, to places, to objects used for worship, or to persons. Exactly the same usage is shown with the word “sanctify.” To sanctify anything is to declare it as belonging to God.
2. In the New Testament:In a few New Testament passages the Old Testament ritual sense reappears, as when Jesus speaks of the temple sanctifying the gold, and the altar the gift (Mat 23:17, Mat 23:19; compare also Heb 9:13; 1Ti 4:5). The prevailing meaning is that which we found in the Old Testament. To sanctify is to consecrate or set apart. We may first take the few passages in the Fourth Gospel. As applied to Jesus in John 10:36; John 17:19, sanctify cannot mean to make holy in the ethical sense. As the whole context shows, it means to consecrate for His mission in the world. The reference to the disciples, “that they themselves also may be sanctified in truth,” has both meanings: that they may be set apart, (for Jesus sends them, as the Father sends Him), and that they may be made holy in truth.

Eze 36:27 I will put My Spirit within you and cause you to walk in My statutes, and you will keep My judgments and do them.

Rom 8:14 "For as many as are led by the Spirit of God, these are sons of God".

Act 7:51 "You stiff-necked and uncircumcised in heart and ears! You always resist the Holy Spirit".