مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3946
Musnad of Abdullah bin Mas'ood
It was narrated from ‘Abdullah concerning the verse, "The (Prophet's) heart lied not in what he (Muhammad (ﷺ)) saw” (an-Najm 53:17), that he said: The Messenger of Allah (ﷺ) saw Jibreel (as) in a suit of the finest brocade, filling the space between heaven and earth.
Musnad Ahmad 3971Its isnad is saheeh]