1 Chronicles 5:9

5:9 In the east they settled as far as the entrance to the desert that stretches to the Euphrates River, for their cattle had increased in numbers in the land of Gilead.

1 Chronicles 19:16-17

19:16 When the Arameans realized they had been defeated by Israel, they sent for reinforcements from beyond the Euphrates River, led by Shophach the commanding general of Hadadezer’s army. 19:17 When David was informed, he gathered all Israel, crossed the Jordan River, and marched against them. David deployed his army against the Arameans for battle and they fought against him.