Albert Barnes Commentary Ephesians 6:22

"whom I have sent unto you for this very purpose, that ye may know our state, and that he may comfort your hearts." — Ephesians 6:22 (ASV)

Whom I have sent to you. The churches where Paul had preached would feel a great interest in his welfare. He was a prisoner at Rome, and it was doubtful what the result would be. In this situation, he felt it proper to dispatch a special messenger to give information about his condition; to state what was happening in Rome; to ask for the prayers of the churches; and to administer consolation to them in their various trials. The same sentiment, in regard to the embassy of Tychicus, is expressed in the epistle to the Colossians, Colossians 4:7–8. No small part of the consolation which he would impart to them would be found in these invaluable letters which he brought to them from the apostle.