Combing the Hair - Section 2 Mishkat al-Masabih 4448
Arabic hadith text
وَعَن عبد الله بن مغفَّل قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنِ التَّرَجُّلِ إِلَّا غِبًّا. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُد وَالنَّسَائِيّ
Translation
‘Abdallah b. Mughaffal said God’s messenger forbade combing the hair except every second day. Tirmidhi, Abu Dawud and Nasa'i transmitted it.