Combing the Hair - Section 2 Mishkat al-Masabih 4439
Arabic hadith text
وَعَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَأْخُذُ مِنْ لِحْيَتِهِ مِنْ عَرْضِهَا وَطُولِهَا. رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ غَرِيبٌ
Translation
‘Amr b. Shu'aib; on his father's authority, said his grandfather told that the Prophet used to take something off the side and the bottom of his beard. Tirmidhi transmitted it, saying this is a gharib tradition.