Omni 1:18

But it came to pass that Mosiah caused that they should be taught in his language. And it came to pass that after they were taught in the language of Mosiah, Zarahemla gave a genealogy of his fathers, according to his memory; and they are written, but not in these plates.

But Mosiah had them taught his language. After they learned Mosiah’s language, Zarahemla told the family history of his fathers from his memory. These things are written down, but not on these plates.

Mosiah had them taught his language. After they learned to speak it, Zarahemla recited his family line from memory. It was written down, though not on these plates.