Musnad Ahmad 27:1223

Abu al-Nadr narrated to us, Abu Aqil—who is Abdullah ibn Aqil—narrated to us, Umar ibn Hamzah ibn Abdullah ibn Umar narrated to us, Salim narrated from his father, who said: I would often remember the saying of the poet while I was looking at the face of the Messenger of Allah, may Allah bless him and grant him peace, upon the pulpit, seeking rain. He would not descend until every water spout would overflow. And I would remember the saying of the poet: "And a fair-skinned one, through whose face rain is sought from the clouds, A provider for the orphans, a protector for the widows." And it is the saying of Abu Talib.