Titus 3:5–7. According to His mercy He saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Which He shed on us abundantly through Jesus Christ our Savior;
That being justified by his grace, we should be made heirs according to the hope of eternal life.
345. Why is Baptism called the "washing of regeneration"?
Because the Holy Spirit in Baptism cleanses us from sin, and gives us a new spiritual life.
1 Pet. 3:21. Baptism is not the putting away of the filth of the flesh, but the answer of a good conscience toward God, by the resurrection of Jesus Christ.
346. Is not Baptism also called a covenant?
Yes; Baptism is a covenant; in Baptism God gives us a new life and His grace, and we promise Him to renounce the devil, and all His works, and all his ways, and to believe in the Father, the Son, and the Holy Spirit.
347. Who enjoy the blessings that God promises in Baptism?
All who remain in the covenant of their Baptism.