The Book of Adornment
48/59. Chapter:
Wearing One's Hair Long
Sunan an-Nasai
أَخْبَرَنَا حَاجِبُ بْنُ سُلَيْمَانَ، عَنْ وَكِيعٍ، عَنْ سُفْيَانَ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْبَرَاءِ، قَالَ مَا رَأَيْتُ مِنْ ذِي لِمَّةٍ أَحْسَنَ فِي حُلَّةٍ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم وَلَهُ شَعْرٌ يَضْرِبُ مَنْكِبَيْهِ .
It was narrated that Al-Bara' said: "I never saw any long haired man in a Hullah who was more handsome than the Messenger of Allah [SAW], and he had hair that came down to his shoulders."
Reference : Sunan an-Nasa'i 5233In-book reference : Book 48, Hadith 194English translation : Vol. 6, Book 48, Hadith 5235