D&C 93:3 · 3 Nephi 11:27
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Seventeen words verbatim; the only divergences are the D&C's opening "And that" and its closing dash where 3 Nephi has a period. Neither text names the other. The clause also stands, in shorter form, at John 14:10–11 ("I am in the Father, and the Father in me", eleven words) and at 3 Nephi 9:15 — the full "and the Father and I are one" tail is what distinguishes the 3 Nephi 11:27 pairing from those.