It is narrated from Sayyiduna Uwaym bin Sa'idah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Allah chose me and chose companions for me, and from among them He made for me ministers, helpers and in-laws. So whoever reviles them, upon him is the curse of Allah, the angels and all of mankind; on the Day of Resurrection no ransom and no compensation will be accepted from him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14421