The wording of the baptismal prayer used in The Church of Jesus Christ of Latter-day Saints is prescribed in the earliest compilation of instructions for Church operations (D&C 20). When an individual is baptized, the person with the proper priesthood authority goes down into the water with the candidate, raises his right arm to the square, calls the individual by the full legal name, and says, "Having been commissioned of Jesus Christ, I baptize you in the name of the Father, and of the Son, and of the Holy Ghost. Amen," and then immerses the candidate (D&C 20:73). A version of the prayer that differs only slightly from this was given by Jesus Christ to the Nephites and is recorded in the Book of Mormon (3 Ne. 11:25).
Earlier in the Book of Mormon there is a somewhat different account of the baptismal prayer that was spoken. When Alma1 in the second century B.C. established the Church among the Nephites, he prayed: "O Lord, pour out thy Spirit upon thy servant, that he may do this work with holiness of heart" (Mosiah 18:12). The baptismal prayer that followed emphasized the covenant represented in baptism and the need for a subsequent baptism of the Spirit: "I baptize thee, having authority from the Almighty God, as a testimony that ye have entered into a covenant to serve him until you are dead as to the mortal body; and may the Spirit of the Lord be poured out upon you; and may he grant unto you eternal life, through the redemption of Christ, whom he has prepared from the foundation of the world" (Mosiah 18:13).
It is informative to compare LDS practice and scriptural accounts with the Christian tradition as reported in E. C. Whitaker, Documents of the Baptismal Liturgy, London, 1970.
Jerry A. Wilson