וַיְשַׁנּ֤וֹ אֶת־טַעְמוֹ֙ בְּעֵ֣ינֵיהֶ֔ם וַיִּתְהֹלֵ֖ל בְּיָדָ֑ם ויתו [וַיְתָיו֙] עַל־דַּלְת֣וֹת הַשַּׁ֔עַר וַיּ֥וֹרֶד רִיר֖וֹ אֶל־זְקָנֽוֹ׃
И он изменил свое поведение перед ними, и притворился безумным в их руках, и царапал двери ворот, и позволил его плевку упасть на его бороду.
Rashi on I Samuel
And feigned madness. He acted insane.11The Midrash relates that Dovid said to ה׳ that he understood all creation of ה׳ with the exception of madness, for which he saw no purpose. ה׳ then responded that He will demonstrate to him the value of madness and that Dovid will need it.12I.e., he wrote in a normal handwriting, irrational statements.
Rashi on I Samuel
He scribbled. He wrote.13He wrote, ‘Ochish the King of Gas owes me one hundred thousand gold coins and his wife owes me fifty.’