וּשְׁאָ֧ר מִסְפַּר־קֶ֛שֶׁת גִּבּוֹרֵ֥י בְנֵֽי־קֵדָ֖ר יִמְעָ֑טוּ כִּ֛י יְהוָ֥ה אֱלֹהֵֽי־יִשְׂרָאֵ֖ל דִּבֵּֽר׃ (ס)
and the residue of the number of the archers, the mighty men of the children of Kedar, shall be diminished; for the LORD, the God of Israel, hath spoken it.’
Read midrashic interpretation of Isaiah 21:17: and classical rabbinic exegesis.