Infinite and eternal sacrifice

The doctrine that Jesus created and atoned for other worlds is outlined in the Prophet Joseph Smith's poetic version of Doctrine and Covenants 76:22-24:

And I heard a great voice bearing record from heav'n

He's the Saviour, and only begotten of God;

By him, of him, and through him, the worlds were all made,

Even all that career in the heavens so broad.

Whose inhabitants, too, from the first to the last, 

Are sav'd by the very same Saviour of ours;

And, of course, are begotten God's daughters and sons

By the vary same truths and very same powers.

-Quoted by Elder Bruce R. McConkie, Christ and the Creation Ensign, June 1982, pp. 10, 11.