Abu Salamah (may Allah have mercy on him) narrates that one night Sayyiduna Usayd bin Hudayr (may Allah be pleased with him) was praying. He said: Suddenly something like a cloud covered me, in which there was light like lamps, and (my pregnant) wife was sleeping by my side, and the horse was tied in the house. I feared that the horse might bolt, and my wife might be frightened and miscarry, so I left off my prayer. In the morning I mentioned this to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "O Usayd! You should have continued reciting; that was an angel who came to listen to the Qur'an."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 559