Numbers 33:40

וישמע הכנעני AND THE CANAANITE HEARD This is stated here to tell you that Aaron’s death was indeed the news he heard — that the clouds of glory that until now had protected Israel had departed, and he therefore believed that liberty was now given to wage war against Israel. It is on this account that this is again recorded here (see Rashi on Numbers 21:1) (Rosh Hashanah 3a).

וַיִּשְׁמַ֗ע הַֽכְּנַעֲנִי֙ מֶ֣לֶךְ עֲרָ֔ד וְהֽוּא־יֹשֵׁ֥ב בַּנֶּ֖גֶב בְּאֶ֣רֶץ כְּנָ֑עַן בְּבֹ֖א בְּנֵ֥י יִשְׂרָאֵֽל׃

And the Kena῾anite king of ῾Arad, who dwelt in the Negev in the land of Kena῾an, heard of the coming of the children of Yisra᾽el.