It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that whenever revelation descended upon the Prophet (peace and blessings be upon him), he would get a headache, so he (peace and blessings be upon him) would apply a coating of henna on his head.
Imam al-Tabarani (may Allah have mercy on him) said: "Only Abu Awn narrated this hadith from Sa'id bin al-Musayyib (may Allah have mercy on him), only al-Ahwas from Abu Awn, and only Sulayman bin al-Hakam bin Awanah from al-Ahwas; Muhammad bin Abi Saminah is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5629
Hadith Takhrij«أخرجه البزار فى «مسنده» برقم: 7852»