The Book of Adornment
48/58. Chapter:
Mentioning the Prohibition of Shaving Part of a Boy's Head and Leaving Part
Sunan an-Nasai
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا مُحَمَّدُ بْنُ بِشْرٍ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ عُمَرَ بْنِ نَافِعٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنِ الْقَزَعِ .
It was narrated that Ibn 'Umar said: "The Messenger of Allah [SAW] forbade Al-Qaza' (shaving part of the head and leaving part)."
Reference : Sunan an-Nasa'i 5230In-book reference : Book 48, Hadith 191English translation : Vol. 6, Book 48, Hadith 5232