Musnad Ahmad 32:1650

'Affan narrated to us, Hammad narrated to us, Thabit narrated to us, from Anas ibn Malik, that the Messenger of Allah (ﷺ) came to Umm Haram, and we brought him dates and ghee. He said: "Return this to its container and this to its skin, for I am fasting." He said: Then he stood and prayed two voluntary rak'ahs with us. He placed Umm Haram and Umm Sulaym behind us, and he placed me to his right—according to what Thabit reckons. He said: So he prayed a voluntary prayer with us on a mat. When he finished his prayer, Umm Sulaym said: "I have a small request, your little servant Anas, supplicate to Allah for him." So he did not leave any good of this world or the Hereafter on that day except that he supplicated for me with it. Then he said: "O Allah, increase his wealth and his children, and bless him in them." Anas said: "My daughter informed me that I have buried from my own loins more than ninety [children], and there is no man among the Ansar who has more wealth than I." Then Anas said: "O Thabit, I do not possess any gold or silver except my ring."