مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4261
Musnad of Abdullah bin Mas'ood
It was narrated from al-A'mash Concerning the verse, "Indeed he (Muhammad (ﷺ) did see of the greatest signs, of his Lord (Allah).” (an-Najm 53:18), that he said: Ibn Mas'ood said: The Prophet (ﷺ) saw (Jibreel (as) wearing a garment of) green brocade from Paradise, filling the horizon.
Musnad Ahmad 4289lts isnad is saheeh, al-Bukhari (3233)]