Musnad Abu Ya'la al-Mawsili 152:269

Abu Khaythama narrated to us, al-Hasan ibn Musa narrated to us, Zuhayr narrated to us, Abu Ishaq al-Shaybani narrated to us, he said: I came to Zirr ibn Hubaysh, and he cast upon me an affection from him, and there were young men with him. They said to me: "Ask him." So he was at a distance of two bows' length or nearer. I asked him, and he said: Abdullah ibn Mas'ud said: "Indeed, the Messenger of Allah (may Allah bless him and grant him peace) saw Gabriel, and he had six hundred wings."