Helaman 8:19 · 1 Nephi 19:10
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Both books cite the same named prophet, Zenos, as a witness of the Messiah's death; Helaman 8:19 adds a biographical fact the corpus states nowhere else — that Zenos 'was slain' for that testimony. The shared element is the named prophet + the death-testimony, not a quoted sentence; Helaman gives the prophet's fate, 1 Nephi 19:10 gives the content of his prophecy (burial + 'three days of darkness'). The phrase 'for the which he was slain' occurs at Helaman 8:19 only; 'testify boldly' recurs at 3 Nephi 6:20 ('they did testify boldly of his death and sufferings'). The phrase 'he was slain' appears at four record verses — Helaman 8:19, 1 Nephi 11:34, Alma 1:9, and Mormon 7:5 ('he was slain by the Jews') — the last three in unrelated contexts. The matching biographical pattern is Zenock's stoning at Alma 33:17 — the only other such fact the corpus gives any of the quoted-only prophets. Citation gap: Helaman 8:20 lists 'also Zenock, and also Ezias, and also Isaiah, and Jeremiah' — 'Ezias' is a named prophet appearing in the corpus only here, with no text anywhere; pure citation gap, recorded as a fact, not a connection. Jeremiah's parenthetical ('that same prophet who testified of the destruction of Jerusalem') cross-refs 1 Nephi 5:13 ('many prophecies which have been spoken by the mouth of Jeremiah') and 1 Nephi 7:14 ('Jeremiah have they cast into prison').