Musnad Ahmad 31:766

Ya'qub narrated to us, he said: I heard my father, from Yazid ibn al-Had, that 'Abdullah ibn Khabbab narrated to him, that Abu Sa'id al-Khudri narrated to him, that Usayd ibn Hudayr, while he was one night reciting in his enclosure, his horse suddenly reared. So he recited, then it reared again, so he recited, then it reared also. Usayd said: I feared that it would trample Yahya—meaning his son—so I stood up to him, and behold, there was something like a canopy above my head, in it were things like lamps. It ascended into the air until I could no longer see it. He said: So I went early to the Messenger of Allah (peace and blessings of Allah be upon him) and said: O Messenger of Allah, while I was last night in the middle of the night reciting in my enclosure, my horse reared. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Read, Ibn Hudayr." He said: So I read, then it reared again. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Read, Ibn Hudayr." So I read, then it reared. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Read, Ibn Hudayr." He said: So I turned away, and Yahya was near it, and I feared that it would trample him, so I saw something like a canopy in which were things like lamps; it ascended into the air until I could no longer see it. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Those were the angels listening to you. If you had continued to read, the people would have seen them in the morning; they would not have hidden themselves from them."