Imam al-Zuhri (may Allah have mercy on him) said: The Messenger of Allah (peace and blessings be upon him) married Sayyidah Zaynab bint Khuzaymah (may Allah be pleased with her). She was known as Umm al-Masakin (Mother of the Poor); she was given this name because she fed the poor so much. She was from Banu Hilal bin Amir bin Sa'sa'ah, and she passed away during the lifetime of the Messenger of Allah (peace and blessings be upon him); her time with him (peace and blessings be upon him) was very short.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20519