 he lost his mind because he was attached to his brothers slave girl so he refused her and sold her to someone else. there was no one among his brothers like him or more perfect in manners than him.
وذهاب عقله اعتلاقه بجارية لأخيه، فمنعها وباعها لغيره، وما كان في إخوته مثله ولا أتم أدبا منه.