Sanctify
"I'm no saint," we may say, but we are saints if we've asked Jesus Christ to forgive our sins and take control of our lives. The word sanctify is directly related to the word saint. The Bible says Christians are sanctified - holy, or set apart, to serve God (see Consecrate). We have a unique identity because the Spirit of the one holy God lives in us, and we have a special job to perform for him.

The word sanctify also indicates the progressive work of the Holy Spirit in our lives, which makes us more and more like Jesus Christ. When we receive God's love through faith, our sins are forgiven, but we don't immediately live completely godly lives. Our decision to accept Christ as Savior and follow him begins the process of sanctification that continues for the rest of our lives. God gradually reorders our habits and desires to match his own, and he continues this work in our daily lives, right up to the moment of death. At the time our sanctification will be complete, and we will be made perfect.

God sanctifies us and sets us apart to serve him.
Matthew 5:48
John 17:17-19
1 Corinthians 1:2; 6:9-10
1 Peter 1:2
Sanctification includes real change in our very nature, a new kind of life, which can only occur through the Holy Spirit's work in our lives.
Ephesians 3:18
1 Thessalonians 4:3-7
Hebrews 9:13-14
We are to tell others about Jesus Christ, so that they also can be  sanctified.
Romans 15:15-16