וַיַּ֣ךְ דָּוִ֔ד אֶת־הֲדַדְעֶ֥זֶר בֶּן־רְחֹ֖ב מֶ֣לֶךְ צוֹבָ֑ה בְּלֶכְתּ֕וֹ לְהָשִׁ֥יב יָד֖וֹ בִּֽנְהַר־[פְּרָֽת׃]
David smote also Hadadezer the son of Rehob, king of Zobah, as he went to establish his dominion at the river Euphrates.
Read kabbalistic (mystical) interpretation of II Samuel 8:3: and classical mystical sources.