Commentary for I Samuel 18:10

וַיְהִ֣י מִֽמָּחֳרָ֗ת וַתִּצְלַ֣ח רוּחַ֩ אֱלֹהִ֨ים ׀ רָעָ֤ה ׀ אֶל־שָׁאוּל֙ וַיִּתְנַבֵּ֣א בְתוֹךְ־הַבַּ֔יִת וְדָוִ֛ד מְנַגֵּ֥ן בְּיָד֖וֹ כְּי֣וֹם ׀ בְּי֑וֹם וְהַחֲנִ֖ית בְּיַד־שָׁאֽוּל׃

And it came to pass on the morrow, that an evil spirit from God came mightily upon Saul, and he raved in the midst of the house; and David played with his hand, as he did day by day; and Saul had his spear in his hand.

Rashi on I Samuel