Faith brings Forgiveness - Enos 1:8

And there came a voice unto me, saying: Enos, thy sins are forgiven thee, and thou shalt be blessed. 

And I, Enos, knew that God could not lie; wherefore, my guilt was swept away. And I said: Lord, how is it done? 

And he said unto me: Because of thy faith in Christ, whom thou hast never before heard nor seen.

It is through faith in Jesus Christ in which sins are forgiven. We are told by King Benjamin:

And moreover, I say unto you, that there shall be no other name given nor any other way nor means whereby salvation can come unto the children of men, only in and through the name of Christ, the Lord Omnipotent. (Mosiah 3:17)

In Jesus' ministry, the principle of forgiveness through faith is evident:

And, behold, a woman in the city, which was a sinner, when she knew that Jesus sat at meat in the Pharisee’s house, brought an alabaster box of ointment, and stood at his feet behind him weeping, and began to wash his feet with tears, and did wipe them with the hairs of her head, and kissed his feet, and anointed them with the ointment. 

And he turned to the woman, and said unto Simon, Seest thou this woman? I entered into thine house, thou gavest me no water for my feet: but she hath washed my feet with tears, and wiped them with the hairs of her head. Thou gavest me no kiss: but this woman since the time I came in hath not ceased to kiss my feet. My head with oil thou didst not anoint: but this woman hath anointed my feet with ointment. Wherefore I say unto thee, Her sins, which are many, are forgiven; for she loved much: but to whom little is forgiven, the same loveth little. 

And he said unto her, Thy sins are forgiven. 

And they that sat at meat with him began to say within themselves, Who is this that forgiveth sins also? 

And he said to the woman, Thy faith hath saved thee; go in peace. (Luke 7:37-38,44-50)

And, behold, men brought in a bed a man which was taken with a palsy: and they sought means to bring him in, and to lay him before him. And when they could not find by what way they might bring him in because of the multitude, they went upon the housetop, and let him down through the tiling with his couch into the midst before Jesus. 

And when he saw their faith, he said unto him, Man, thy sins are forgiven thee.

And the scribes and the Pharisees began to reason, saying, Who is this which speaketh blasphemies? Who can forgive sins, but God alone? 

But when Jesus perceived their thoughts, he answering said unto them, What reason ye in your hearts? Whether is easier, to say, Thy sins be forgiven thee; or to say, Rise up and walk? But that ye may know that the Son of man hath power upon earth to forgive sins, (he said unto the sick of the palsy,) I say unto thee, Arise, and take up thy couch, and go into thine house. 

And immediately he rose up before them, and took up that whereon he lay, and departed to his own house,glorifying God. (Luke 5:18-25)

 Note that in all of these examples, those who showed faith had acted before receiving the blessing of forgiveness. As was shown before, faith is a principle of action. And as is shown here, not only does faith bring miracles, it also brings forgiveness.