כִּ֤י נִבְעֲרוּ֙ הָֽרֹעִ֔ים וְאֶת־יְהוָ֖ה לֹ֣א דָרָ֑שׁוּ עַל־כֵּן֙ לֹ֣א הִשְׂכִּ֔ילוּ וְכָל־מַרְעִיתָ֖ם נָפֽוֹצָה׃ (ס)
For the shepherds are become brutish, And have not inquired of the LORD; Therefore they have not prospered, And all their flocks are scattered.
Read halakhic rulings (Jewish law) on Jeremiah 10:21: and classical halakhic sources.