Baptism and Gift of the Holy Ghost
Brings Remission of Sins

2 Nephi 31

17 Wherefore, do the things which I have told you I have seen that your Lord and your Redeemer should do; for, for this cause have they been shown unto me, that ye might know the gate by which ye should enter. For the gate by which ye should enter is repentance and baptism by water; and then cometh a remission of your sins by fire and by the Holy Ghost.

3 Nephi 12

2 And again, more blessed are they who shall believe in your words because that ye shall testify that ye have seen me, and that ye know that I am. Yea, blessed are they who shall believe in your words, and come down into the depths of humility and be baptized, for they shall be visited with fire and with the Holy Ghost, and shall receive a remission of their sins.

D&C 19
31 And of tenets thou shalt not talk, but thou shalt declare repentance and faith on the Savior, and remission of sins by baptism, and by fire, yea, even the Holy Ghost.

Dallin H. Oaks

In partaking of the sacrament, we can renew the effects of our baptism. When we desire a remission of our sins through the Atonement of our Savior, we are commanded to repent and come to him with a broken heart and a contrite spirit (see 3 Ne. 9:20; 3 Ne. 12:19; Moro. 6:2; D&C 20:37). In the waters of baptism we witness to the Lord that we have repented of our sins and are willing to take his name upon us and serve him to the end (see D&C 20:37). The effects are described by Nephi: "For the gate by which ye should enter is repentance and baptism by water; and then cometh a remission of your sins by fire and by the Holy Ghost" (2 Ne. 31:17; see also Moro. 6:4). That last promise is fulfilled as a result of our receiving the gift of the Holy Ghost. ("Always Have His Spirit," Ensign, Nov. 1996, p. 61)