Jibreel used to come to the Prophet ﷺ in the form of Dihyah.
كان جبريل عليه السلام يأتي النبي ﷺ في صورة دحية.
Ahmad (5857) narrated it from Affan, who said, Hammad bin Salama told us, from Ishaq bin Suwayd, from Yahya bin Yamar, from Ibn Umar, and he related the well known hadith of Jibreel, then said the aforementioned statement. Ibn Hajar graded the hadith sahih in Al-Isabah (2399) and attributed it to Nasai, and it is found with this chain in Juz Imla Nasai (37).