Abu Dawud 4159

[Its isnad is daif] Reported by Tirmidhi, Chapter on Clothing, the section on what has been said about the prohibition of combing the hair except... h: 1756, and Nasai, h: 5058, from the hadith of Hisham bin Hassan through this same chain. Tirmidhi said, "Hasan sahih," and Ibn Hibban graded it sahih, h: 1480. Hisham bin Hassan used the form "an" in his transmission, and the hadith of Nasai, 8/132, h: 561, suffices in its place, and its chain is sahih.