Sunan Abi Dawud, 5114

Abu Hurairah reported the Prophet (May peace be upon him) as saying :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

Abu Huraira رضي الله عنه a rapporté que le Prophète ﷺ a dit : « Si un homme devient le client d’un peuple sans la permission de ses maîtres (c’est-à-dire ceux qui l’ont affranchi), il subira la malédiction d’Allah, des anges et de tous les gens ; aucun acte d’adoration obligatoire ou surérogatoire ne sera accepté de lui. »