Musnad Abu Ya'la al-Mawsili 129:161

Zuhayr narrated to us, Abdullah bin Bakr narrated to us, Humayd narrated to us, from Anas, who said: The Messenger of Allah (ﷺ) entered upon Umm Sulaym, and she brought him clarified butter and dates. He said: "Return your butter to its skin and your dates to its container, for I am fasting." Then he stood and prayed a prayer that was not obligatory, and we prayed. Then he supplicated for Umm Sulaym and the people of her household. Umm Sulaym said: "I have a small request." He said: "And what is it?" She said: "Your servant, Anas." He said: "So he supplicated for me for the good of this world and the Hereafter, and said: 'O Allah, provide him with wealth and children, and bless him in them.'" He (Anas) said: "For I am indeed among the Ansar with the most children." And Aminah informed me that he had buried from his own loins, before Al-Hajjaj arrived in Basra, one hundred and twenty-something [children].