Sahih Bukhari Volume 8, Book 73, Hadith Number 233.

Narated By Jabir bin ‘Abdullah : That he heard Allah’s Apostle saying. “Then there was a pause in the revelation of the Divine Inspiration to me. Then while I was walking all of a sudden I heard a voice from the sky, and I raised my sight towards the sky and saw the same angel who had visited me in the cave of Hira,’ sitting on a chair between the sky and the earth.”