مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3725
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: The Messenger of Allah (ﷺ) saw Jibreel in his true form: he has six hundred wings, each of which fills the horizon and there falls from his wings things of different colours, pearls and rubies, of which Allah knows best.
Musnad Ahmad 3748Its isnad is da'eef because Shareek is da'eef]