Sahih al-Bukhari 1789

Abu Nuaym narrated to us: Hammam narrated to us: Ata narrated to us, who said: Safwan ibn Yala ibn Umayyah told me—meaning from his father—that a man came to the Prophet, peace and blessings be upon him, at al-Jiरणanah wearing a cloak with traces of khaluq perfume—or, he said, yellow coloring. He said: What do you instruct me to do for my Umrah? Allah sent revelation to the Prophet, peace and blessings be upon him, and he was covered with a cloth. I wished I could see the Prophet when revelation was descending upon him. Umar said: Come, would you like to look at the Prophet while Allah is sending revelation down to him? I said: Yes. He lifted the edge of the cloth, and I looked at him. He was making a rumbling sound—I think he said, like the snoring of a young camel. When the revelation had lifted from him, he said: Where is the man who asked about Umrah? Take off your cloak, wash the traces of khaluq from yourself, remove the yellow coloring, and do in your Umrah what you do in your Hajj.