King James Version (KJV)
David smote also Hadadezer, the son of Rehob, king of Zobah, as he went to recover his border at the river Euphrates. {Hadadezer: or, Hadarezer}
Modern English
David struck also Hadadezer the son of Rehob, king of Zobah, as he went to recover his dominion at the River.
Hebrew
וַיַּ֣ךְ דָּוִ֔ד אֶת־הֲדַדְעֶ֥זֶר בֶּן־רְחֹ֖ב מֶ֣לֶךְ צוֹבָ֑ה בְּלֶכְתּ֕וֹ לְהָשִׁ֥יב יָד֖וֹ בִּֽנְהַר־פְּרָֽת׃
vayak david ʾet-hadadʿezer ben-rḥob melek ṣvobah blektvo lhashiyb yadvo binhar-prat