Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "O Banu Abd al-Muttalib! I have asked Allah for three things for you: I prayed to Him to keep firm the one of you who stands (as leader), to teach the ignorant among you, and to guide those of you who have gone astray. And I also prayed to Him to make you generous, brave and merciful. If a man were to stand between the Corner and the Maqam, praying and fasting, and then die while he harbours hatred for the family of Muhammad (peace and blessings be upon him) - with whom Allah is pleased - he would enter Hell."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11364