וַיְמָאֵ֣ן ׀ אֱד֗וֹם נְתֹן֙ אֶת־יִשְׂרָאֵ֔ל עֲבֹ֖ר בִּגְבֻל֑וֹ וַיֵּ֥ט יִשְׂרָאֵ֖ל מֵעָלָֽיו׃ (פ)
Thus Edom refused to give Israel passage through his border; wherefore Israel turned away from him.
Read halakhic rulings (Jewish law) on Numbers 20:21: and classical halakhic sources.