2 Samuel 10:19 in the King James Version
And when all the kings that were servants to Hadarezer saw that they were smitten before Israel, they made peace with Israel, and served them. So the Syrians feared to help the children of Ammon any more.
Context
18 The Syrians fled before Israel; and David killed seven hundred charioteers of the Syrians and forty thousand horsemen, and struck Shobach the captain of their army, so that he died there.
19 When all the kings who were servants to Hadadezer saw that they were defeated before Israel, they made peace with Israel and served them. So the Syrians were afraid to help the children of Ammon any more.