Musnad Ahmad 32:1010

Ubaydah ibn Humayd narrated to us, from Humayd, from Anas, who said: The Prophet, peace and blessings of Allah be upon him, came to Umm Sulaym, and she brought near to him ghee and dates. The Prophet, peace and blessings of Allah be upon him, said: "Return your ghee to your skin-container and your dates to your vessel, for I am fasting." Then he stood and prayed in a corner of the house, and we prayed with his prayer. Then he supplicated for Umm Sulaym and her family. Then Umm Sulaym said: "O Messenger of Allah, I have a special request." He said: "And what is it?" She said: "Anas." He said: So he did not leave any good of the Hereafter or the world on that day, except that he supplicated for it with his words: "O Allah, provide him with wealth and children, and bless him in them." Anas said: My daughter told me that there have been buried from my loins one hundred and twenty-something, and I am among the wealthiest of the Ansar.