God should redeem his people

For behold, did not Moses prophesy unto them concerning the coming of the Messiah, and that God should redeem his people? Yea, and even all the prophets who have prophesied ever since the world began—have they not spoken more or less concerning these things?

Have they not said that God himself should come down among the children of men, and take upon him the form of man, and go forth in mighty power upon the face of the earth?

Yea, and have they not said also that he should bring to pass the resurrection of the dead, and that he, himself, should be oppressed and afflicted?

Mosiah 13:33-35

Salvation doesn’t come by any law given but through the infinite Atonement of the Savior. Salvation is a gift around which the plan of salvation was organized but the plan was not simply a vehicle of obedience, it is a vehicle of transformation and grace. The law helps us in the process of transformation but grace is a gift from Christ to those who accept him in deed.