(7) بَابُ إِذَا قَالَ أَحَدُكُمْ آمِينَ. وَالْمَلاَئِكَةُ فِي السَّمَاءِ، فَوَافَقَتْ إِحْدَاهُمَا الأُخْرَى، غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Narrated Abu 'Is-haq-Ash-Shaibani:
I asked Zir bin Hubaish regarding the Statement of Allah: "And was at a distance Of but two bowlengths Or (even) nearer; So did (Allah) convey The Inspiration to His slave (Gabriel) and then he (Gabriel) Conveyed (that to Muhammad). (53.9-10) On that, Zir said, "Ibn Mas`ud informed us that the Prophet (ﷺ) had seen Gabriel having 600 wings."
Reference: Sahih al-Bukhari 3232
In-book reference: Book 59, Hadith 43
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 54, Hadith 455