The Lord promises Alma the Elder eternal life.
20 Thou art my servant; and I covenant with thee that thou shalt have eternal life; and thou shalt serve me and go forth in my name, and shalt gather together my sheep.
The Prophet Joseph Smith said:
“After a person has faith in Christ, repents of his sins, and is baptized for the remission of his sins and receives the Holy Ghost (by the laying on of hands), which is the first Comforter, then let him continue to humble himself before God, hungering and thirsting after righteousness, and living by every word of God, and the Lord will soon say unto him, ‘Son, thou shalt be exalted.’ When the Lord has thoroughly proved him, and finds that the man is determined to serve Him at all hazards, then the man will find his calling and his election made sure, then it will be his privilege to receive the other Comforter, which the Lord hath promised the Saints. . . . Now what is this other Comforter? It is no more nor less that the Lord Jesus Christ Himself; and this is the sum and substance of the whole matter; that when any man obtains this last Comforter, he will have the personage of Jesus Christ to attend him, or appear unto him from time to time, and even He will manifest the Father unto him, and they will take up their abode with him, and the visions of the heavens will be opened unto him, and the Lord will teach him face to face, and he may have a perfect knowledge of the mysteries of the Kingdom of God; and this is the state and place the ancient Saints arrived at when they had such glorious visions—Isaiah, Ezekiel, John upon the Isle of Patmos, St. Paul in the three heavens, and all the Saints who held communion with the general assembly and Church of the First Born.”
(History of the Church, 3:380–81.)