Why is Christ's sanctification important for Christians?

In John 17:19, Jesus says, 'And for their sakes I sanctify myself, that they also might be sanctified through the truth.' This sanctification indicates that Christ set Himself apart for the purpose of atoning for the sins of His people, making Him the perfect sacrifice. His holiness and sinlessness ensure that His sacrifice is accepted by God, thereby allowing believers to be clothed in His righteousness and made holy in God's sight. The sanctification of believers is ultimately a consequence of Christ's self-set apartness for redemptive work.