Acts 22:16

Wash, &c. The contrition and charity of St. Paul had, no doubt, merited for him the remission of his sins at the moment of his conversion. Still were these effects to be attributed to the desire of the sacrament of baptism, without which the council of Trent defines that the forgiveness of sins, and the punishment due to them, are not obtained. It likewise added a new degree of lustre to his innocence and purity. (Tirinus) — Calling upon his name. In such manner, says St. Chrysostom, (hom. xlvii.) as we invoke the only true God; and as we invoke the saints, and pray to them, that they would pray for us. (Witham)

4. The counsel and encouragement he gave him to join himself to the Lord Jesus by baptism (v. 16): Arise, and be baptized, He had in his circumcision been given up to God, but he must now by baptism be given up to God in Christ—must embrace the Christian religion and the privileges of it, in submission to the precepts of it. This must now be done immediately upon his conversion, and so was added to his circumcision: but to the seed of the faithful it comes in the room of it; for it is, as that was to Abraham and his believing seed, a seal of the righteousness which is by faith. (1.) The great gospel privilege which by baptism we have sealed to us is the remission of sins: Be baptized and wash away thy sins; that is, "Receive the comfort of the pardon of thy sins in the through Jesus Christ and lay hold of his righteousness for that purpose, and receive power against sin for the mortifying of thy corruption;" for our being washed includes our being both justified and sanctified, 1 Cor 6 11. Be baptized, and rest not in the sign, but make sure of the thing signified, the putting away of the filth of sin. (2.) The great gospel duty which by our baptism we are bound to is to call on the name of the Lord, the Lord Jesus; to acknowledge him to be our Lord and our God, and to apply to him accordingly; to give honour to him, to put all our petitions in his hand. To call on the name of Jesus Christ our Lord (Son of David, have mercy on us) is the periphrasis of a Christian, 1 Cor 1 2. We must wash away our sins, calling on the name of the Lord; that is, we must seek for the pardon of our sins in Christ's name, and in dependence on him and his righteousness. In prayer, we must not any longer call God the God of Abraham, but the Father of our Lord Jesus Christ, and in him our Father; in every prayer, our eye must be to Christ. (3.) We must do this quickly. Why tarriest thou? Our covenanting with God in Christ is needful work, that must not be deferred. The case is so plain that it is needless to deliberate; and the hazard so great that it is folly to delay. Why should not that be done at the present time that must be done some time, or we are undone?

Verses 12-21 The apostle goes on to relate how he was confirmed in the change he had made. The Lord having chosen the sinner, that he should know his will, he is humbled, enlightened, and brought to the knowledge of Christ and his blessed gospel. Christ is here called that Just One; for he is Jesus Christ the righteous. Those whom God has chosen to know his will, must look to Jesus, for by him God has made known his good-will to us. The great gospel privilege, sealed to us by baptism, is the pardon of sins. Be baptized, and wash away thy sins; that is, receive the comfort of the pardon of thy sins in and through Jesus Christ, and lay hold on his righteousness for that purpose; and receive power against sin, for the mortifying of thy corruptions. Be baptized, and rest not in the sign, but make sure of the thing signified, the putting away of the filth of sin. The great gospel duty, to which by our baptism we are bound, is, to seek for the pardon of our sins in Christ's name, and in dependence on him and his righteousness. God appoints his labourers their day and their place, and it is fit they should follow his appointment, though it may cross their own will. Providence contrives better for us than we do for ourselves; we must refer ourselves to God's guidance. If Christ send any one, his Spirit shall go along with him, and give him to see the fruit of his labours. But nothing can reconcile man's heart to the gospel, except the special grace of God.