Firstborn See also Church of the Firstborn; Firstling; TG Jesus Christ, Firstborn; BD Firstborn Jacob2, my firstborn in days of tribulation, 2 Ne. 2:1. Lehi1 speaks to children of his firstborn Laman1, 2 Ne. 4:3. firstborn among sons of Aaron holds right of presidency over Aaronic Priesthood, D&C 68:16–17. priesthood, right of firstborn, came down from fathers, Abr. 1:3.