וְעַתָּה֙ אַל־תְּנַקֵּ֔הוּ כִּ֛י אִ֥ישׁ חָכָ֖ם אָ֑תָּה וְיָֽדַעְתָּ֙ אֵ֣ת אֲשֶׁ֣ר תַּֽעֲשֶׂה־לּ֔וֹ וְהוֹרַדְתָּ֧ אֶת־שֵׂיבָת֛וֹ בְּדָ֖ם שְׁאֽוֹל׃
Rashi on I Kings
For you are a wise man. Turn your attention to find for him a capital iniquity on account of another matter. This is [what it means by], “You will know how to deal with him.”