Sayyidah Fatimah bint Rasulullah (peace and blessings be upon him) (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) came out to us on the evening of Arafah and said: "Allah has boasted of you and has forgiven you in general, and Ali in particular. I am the Messenger of Allah to you, and I do not show favouritism to my relatives. This is Jibril telling me that the truly fortunate one is he who loves Ali during his life and after his death, and the wretched, utterly wretched one is he who hates Ali during his life and after his death."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19229