Musnad Abu Ya'la al-Mawsili 155:268

Abu Ma'mar narrated to us, Jarir narrated to us, from 'Umarah ibn al-Qa'qa', from Abu Zur'ah, from Abu Hurayrah; and Mughirah from al-Harith al-'Ukli, from Abu Zur'ah, from Abu Hurayrah, who said: I will not cease to love the Banu Tamim after three things I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: They are the most severe of my nation against the Dajjal. And 'Aishah had a slave girl from the children of Isma'il. When the captives of Khawlan arrived, 'Aishah said: "O Messenger of Allah, will you not let me buy from them?" He said: "No." Then, when the captives of Banu al-'Anbar arrived, he said: "Buy, for they are the children of Isma'il." And the alms (sadaqat) of the Banu Tamim came, and he said: "These are the alms of our people."