Westminster Larger Catechism

Baptism is a sacrament of the New Testament, wherein Christ hath ordained the washing with water in the name of the Father, and of the Son, and of the Holy Ghost,¹⁰⁵⁸ to be a sign and seal of ingrafting into himself,¹⁰⁵⁹ of remission of sins by his blood,¹⁰⁶⁰ and regeneration by his Spirit;¹⁰⁶¹ of adoption,¹⁰⁶² and resurrection unto everlasting life;¹⁰⁶³ and whereby the parties baptized are solemnly admitted into the visible church,¹⁰⁶⁴ and enter into an open and professed engagement to be wholly and only the Lord's.¹⁰⁶⁵