The following is from thewestminsterstandard.org:
Q. 91. How do the Sacraments become effectual means of salvation?
A. The Sacraments become effectual means of salvation, not from any virtue in them, or in him that doth administer them; but only by the blessing of Christ, and the working of his Spirit in them that by faith receive them.
Q. 92. What is a Sacrament?
A. A Sacrament is a holy ordinance instituted by Christ; wherein, by sensible signs, Christ and the benefits of the new covenant are represented, sealed, and applied to believers.
Q. 93. Which are the Sacraments of the New Testament?
A. The Sacraments of the New Testament are Baptism, and the Lord’s Supper.
Q. 94. What is Baptism?
A. Baptism is a Sacrament, wherein the washing with water, in the name of the Father, and of the Son, and of the Holy Ghost, doth signify and seal our ingrafting into Christ, and partaking of the benefits of the covenant of grace, and our engagement to be the Lord’s.
Q. 95. To whom is Baptism to be administered?
A. Baptism is not to be administered to any that are out of the visible Church, till they profess their faith in Christ, and obedience to him; but the infants of such as are members of the visible Church are to be baptized.
