Jacob 1:1 · Jacob 7:27
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The back-reference is verbal: 'the things which my brother Nephi had commanded me,' said while handing over the plates, shares the commandment-lexeme ('a commandment', 1:1; 'had commanded me', 7:27) + 'Nephi' with 1:1 and points to the only Nephi-to-Jacob commandment the book records. The book's last verse executes its first.