וַיַּכּ֨וּ אֹת֤וֹ וְאֶת־בָּנָיו֙ וְאֶת־כָּל־עַמּ֔וֹ עַד־בִּלְתִּ֥י הִשְׁאִֽיר־ל֖וֹ שָׂרִ֑יד וַיִּֽירְשׁ֖וּ אֶת־אַרְצֽוֹ׃
So they smote him, and his sons, and all his people, until there was none left him remaining; and they possessed his land.
Read halakhic rulings (Jewish law) on Numbers 21:35: and classical halakhic sources.