God spake unto Moses, saying: Behold, I am the Lord God Almighty, and Endless is my name; for I am without beginning of days or end of years; and is not this endless? The Book of Moses 1:3
I am Alpha and Omega, Christ the Lord; yea, even I am he, the beginning and the end, the Redeemer of the world. ...
I am endless, and the punishment which is given from my hand is endless punishment, for Endless is my name. Doctrine & Covenants 19:1