JESUS, THE FIRST AND THE LAST
Genesis 1:2 I am the Beginning and the End; the Almighty God. By mine Only Begotten I created these things.
Hebrews 12:2 Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
Book of Mormon
Moroni 6:5 And their names were taken, that they might be remembered and nourished by the good word of God, to keep them in the right way, to keep them continually watchful unto prayer, relying alone upon the merits of Christ, who was the author and the finisher of their faith.
Doctrine & Covenants
D&C 34:1a Listen to the voice of the Lord your God, even Alpha and Omega, the beginning and the end, whose course is one eternal round, the same today as yesterday and for ever. 1b I am Jesus Christ, the Son of God, who was crucified for the sins of the world, even as many as will believe on my name, that they may become the sons of God, even one in me as I am in the Father, as the Father is one in me, that we may be one.