וַיֹּ֙אמֶר֙ אַבְשָׁל֔וֹם וָלֹ֕א יֵֽלֶךְ־נָ֥א אִתָּ֖נוּ אַמְנ֣וֹן אָחִ֑י וַיֹּ֤אמֶר לוֹ֙ הַמֶּ֔לֶךְ לָ֥מָּה יֵלֵ֖ךְ עִמָּֽךְ׃
Then said Absalom: ‘If not, I pray thee, let my brother Amnon go with us.’ And the king said unto him: ‘Why should he go with thee?’
Read midrashic interpretation of II Samuel 13:26: and classical rabbinic exegesis.