John 17:19

Jesus did not mean that He intended to make Himself more holy than He already was since that would have been impossible. He set Himself apart to do God’s will partially for the sake of His disciples. He is our example of perfect sanctification, and His sanctification makes ours possible. Without the sacrificial death of Jesus there would be no salvation and no mission for us. There would be no sanctification for us either. One of the purposes of Jesus’ death was to set believers apart to God and His mission for them to function as priests in the world (cf. 1 Peter 2:9).