D&C 19:1 · 3 Nephi 9:18
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Both are first-person self-namings by the same title pair. Divergence: the revelation interposes 'Christ the Lord; yea, even I am he' between the two halves and closes on 'the Redeemer of the world' where 3 Nephi opens on 'the light and the life of the world'. 'I am Alpha and Omega' stands at thirteen frozen verses; besides these two, at Revelation 1:8, 1:11, 21:6, 22:13, and D&C 38:1, 45:7, 63:60, 68:35, 84:120, 112:34, 132:66.