Musnad Ahmad 32:729

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Qatadah, from Anas: "The Prophet, peace and blessings of Allah be upon him, was brought the Buraq on the night he was taken on the Night Journey, saddled and bridled, so that he might mount it. It became difficult for him. Gabriel said to it: 'What makes you do this? By Allah, no one has ever mounted you who is more honorable to Allah than him.' It then broke out in a sweat."