וְלֹ֖א תָּס֑וּרוּ כִּ֣י ׀ אַחֲרֵ֣י הַתֹּ֗הוּ אֲשֶׁ֧ר לֹֽא־יוֹעִ֛ילוּ וְלֹ֥א יַצִּ֖ילוּ כִּי־תֹ֥הוּ הֵֽמָּה׃
and turn ye not aside; for then should ye go after vain things which cannot profit nor deliver, for they are vain.
Read midrashic interpretation of I Samuel 12:21: and classical rabbinic exegesis.