Sanctification is inseparable from regeneration; where there is one, the other must also exist. Sanctification is the process of making holy, whether in the OT or the NT. God’s holiness is complete, comparable to no one else, and is incompatible with sin. Man’s holiness is progressive as it seeks to match the holiness of God in dedicating everything to Him. Both Testaments multiply references to God’s holiness as the foundation for human holiness. The believer progresses in his own sanctification through the ministry of the Holy Spirit and through attention to the Scripture, but humans also have a role in sanctification. They must live out what they possess by the grace of God.
Read this article from the Masters Seminary Journal in PDF format here.