13:25Ar-Ra'd

" The protection granted by Muslims is one and must be respected by the humblest of them. And he who broke the covenant made by a Muslim, there is a curse of Allah, of his angels, and of the whole people upon him, and neither an obligatory act nor a supererogatory act would be accepted from him as recompense on the Day of Resurrection."

" He who violated the covenant with a Muslim, there is upon him the curse of Allah, of angels and of all people. Neither an obligatory act nor a supererogatory act would be accepted from him as recompense on the Day of Resurrection; and in the hadith transmitted by two other narrators these words are not found:" He who claimed false paternity." And in the hadith transmitted by Waki' there is no mention of the Day of Resurrection.

if a man becomes the client of any people without the permission of his patrons (i.e. those who have freed him), on him will be the curse of Allah, of angels and of all people; no obligatory or supererogatory worship will be accepted from him.