לָכֵ֞ן שִׁמְע֣וּ עֲצַת־יְהוָ֗ה אֲשֶׁ֤ר יָעַץ֙ אֶל־אֱד֔וֹם וּמַ֨חְשְׁבוֹתָ֔יו אֲשֶׁ֥ר חָשַׁ֖ב אֶל־יֹשְׁבֵ֣י תֵימָ֑ן אִם־לֹ֤א יִסְחָבוּם֙ צְעִירֵ֣י הַצֹּ֔אן אִם־לֹ֥א יַשִּׁ֛ים עֲלֵיהֶ֖ם נְוֵהֶֽם׃
Rashi on Jeremiah
the young of the flock. The despised of the nations, and our Rabbis [Yoma 10] expounded that it refers to Persia, who was the youngest of Japheth’s sons.