Is it really Jibril?
Lizzie discusses the Hadith of Gabriel with a Muslim. Gabriel doesn’t identify himself, the companions have to take Muhammad’s word for it.
Umar ibn al-Khattab said: One day when we were with God’s messenger, a man with very white clothing and very black hair came up to us. No mark of travel was visible on him, and none of us recognized him. Sitting down before the Prophet, leaning his knees against his, and placing his hands on his thighs, he said, “Tell me, Muhammad, about submission.” He replied, ‘Submission means that you should bear witness that there is no god but God and that Muhammad is God’s messenger, that you should perform the ritual prayer, pay the alms tax, fast during Ramadan, and make the pilgrimage to the House if you are able to go there.” The man said, “You have spoken the truth.” We were surprised at his questioning him and then declaring that he had spoken the truth. He said “Now tell me about faith.” He replied, “Faith means that you have faith in God, His angels, His books, His messengers, and the Last Day, and that you have faith in the measuring out, both its good and its evil.” Remarking that he had spoken the truth, he then said, “Now tell me about doing what is beautiful.” He replied, “Doing what is beautiful means that you should worship God as if you see Him, for even if you do not see Him, He sees you.” Then the man said, “Tell me about the Hour” The Prophet replied, “About that he who is questioned knows no more than the questioner.” The man said, “Then tell me about its marks.” He said, “The slave girl will give birth to her mistress, and you will see the barefoot, the naked, the destitute, and the shepherds vying with each other in building.” Then the man went away. After I had waited for a long time, the Prophet said to me, “Do you know who the questioner was, ‘Umar?” I replied, “God and His messenger know best. “He said, “He was Gabriel. He came to teach you your religion. ”