Ya'la bin Umayyah (may Allah be pleased with him) said: A man came to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was at al-Ji'ranah, wearing a cloak (jubbah) that had traces of khaluq (a saffron-based perfume) on it. He said: "What do you command me to do in my Umrah?" Then Allah Almighty sent down revelation upon him (peace and blessings be upon him). Ya'la (may Allah be pleased with him) said: I greatly longed to see revelation descending upon him (peace and blessings be upon him). Umar (may Allah be pleased with him) said: "Would you like to see revelation coming down upon the Prophet (peace and blessings be upon him)?" I said: "Yes." So he lifted the cloth from one side, and I looked at him (peace and blessings be upon him), and a sound was coming from him (peace and blessings be upon him). When that state passed, he (peace and blessings be upon him) said: "Where is the one who asked about Umrah? Let him take off this cloak and wash off the traces of khaluq, and do in Umrah just as you do in your Hajj."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9097