1 Tawarikh 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 Tawarikh 18:3

18:3 David defeated King Hadadezer of Zobah as far as Hamath, when he went to extend his authority ¹  to the Euphrates River. ² 

[18:3]  ¹ tn Heb “hand.”

[18:3]  ² tn Heb “when he went to set up his hand at the Euphrates River.” The Hebrew word יָד (yad, “hand”) is usually understood to mean “control” or “dominion” here. However, since יָד does occasionally refer to a monument, perhaps one could translate, “to set up his monument at the Euphrates River” (i.e., as a visible marker of the limits of his dominion). For another example of the Hiphil of נָצַב (natsav) used with יָד (“monument”), see 1 Sam 15:12.