Musnad Ahmad 31:813

Ya'qub narrated to us, my father narrated to us, from Salih. Ibn Shihab said: Abu Umamah ibn Sahl narrated to me that he heard Abu Sa'id al-Khudri say: The Messenger of Allah (peace and blessings of Allah be upon him) said: "While I was sleeping, I saw the people being presented to me, and upon them were shirts. Some of them reached the breasts, and some of them reached less than that. And Umar ibn al-Khattab passed by me, and upon him was a shirt that he was dragging." They said: "How did you interpret it, O Messenger of Allah?" He said: "The religion." Ya'qub said: I do not count how many times I heard him say: "Salih narrated to us from Ibn Shihab."