ENOfficial
He told that the Prophet (ﷺ) said on the day of Badr, "This is Gabriel holding his horse's head with the accoutrements of war on him." Bukhari transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ يَوْمَ بَدْرٍ: «هَذَا جِبْرِيلُ آخِذٌ بِرَأْسِ فرسه عَلَيْهِ أَدَاة الْحَرْب» . رَوَاهُ البُخَارِيّ
sunnah.com