Ata bin Saib says that once I brought some charity to Sayyida Umm Kulthum bint Ali. She refused to accept it and said that a freed slave of the Prophet (ﷺ), whose name was Mehran, narrated this hadith to me: The Prophet (ﷺ) said, "Charity is not lawful for us, the family of Muhammad, and a freed slave of any people is also counted among them."
Hadith Referenceمسند احمد / مسند المدنيين رضي الله عنهم اجمعين / 16399