Midrash for I Samuel 13:13
וַיֹּ֧אמֶר שְׁמוּאֵ֛ל אֶל־שָׁא֖וּל נִסְכָּ֑לְתָּ לֹ֣א שָׁמַ֗רְתָּ אֶת־מִצְוַ֞ת יְהוָ֤ה אֱלֹהֶ֙יךָ֙ אֲשֶׁ֣ר צִוָּ֔ךְ כִּ֣י עַתָּ֗ה הֵכִ֨ין יְהוָ֧ה אֶת־מַֽמְלַכְתְּךָ֛ אֶל־יִשְׂרָאֵ֖ל עַד־עוֹלָֽם׃
And Samuel said to Saul: ‘Thou hast done foolishly; thou hast not kept the commandment of the LORD thy God, which He commanded thee; for now would the LORD have established thy kingdom upon Israel for ever.
Sifrei Devarim
"and so that he not turn aside from the mitzvah": even a "slight" mitzvah of a prophet. And thus is it written (I Samuel 13:13) "And Samuel said to Saul: You have acted foolishly. You have not kept the mitzvah, etc." "and so that he not turn aside from the mitzvah, right or left": even if he (seems to be) told that right is left and left is right.
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