וַיֹּ֥אמֶר אָכִ֖ישׁ אֶל־עֲבָדָ֑יו הִנֵּ֤ה תִרְאוּ֙ אִ֣ישׁ מִשְׁתַּגֵּ֔עַ לָ֛מָּה תָּבִ֥יאוּ אֹת֖וֹ אֵלָֽי׃
Then said Achish unto his servants: ‘Lo, when ye see a man that is mad, wherefore do ye bring him to me?
Read Midrashic interpretations of I Samuel 21:15: rabbinic exegesis from Bereshit Rabbah, Shemot Rabbah and classical Midrash sources, free.