First-born in tribulation, not the literal first-born, but it appears to have a role in how he views Jacob.
(note for 2 Nephi 2:1)
December 6, 2010 at 08:37 AM
2 Nephi 2:1
And now, Jacob, I speak unto you: Thou art my first-born in the days of my tribulation in the wilderness. And behold, in thy childhood thou hast suffered afflictions and much sorrow, because of the rudeness of thy brethren.
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mdjensen