1 Chronicles 19:19

And when the servants of Hadarezer saw that they were put to the worse before Israel, they made peace with David, and became his servants: neither would the Syrians help the children of Ammon any more.

Cross-reference

1 Chronicles 14:17 shows David’s fame bringing fear on nations—the Syrians’ submission here is a direct outcome of that fear.

2 Samuel 10:19 is the parallel account of this same event, nearly verbatim, confirming the historical record.

Psalm 18:44 describes foreigners submitting to David—exactly what the Syrian servants do here, obeying after defeat.