(22) Clothing
كتاب اللباس
(4a) Chapter: Combing the Hair - Section 1
(3) باب الترجل - الفصل الأول
Mishkat al-Masabih 4426 
Nafi‘ quoted Ibn ‘Umar as saying he had heard the Prophet forbidding qaza'. Nafi' was asked what qaza’ was and replied that it was having part of a boy’s head shaved arid leaving part unshaven. (Bukhari and Muslim.) Some made the explanation a part of the tradition.
وَعَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ: سَمِعْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَنْهَى عَنِ الْقَزَعِ. قِيلَ لِنَافِعٍ: مَا الْقَزَعُ؟ قَالَ: يُحْلَقُ بعضُ رَأس الصبيِّ وَيتْرك البعضُ وَألْحق بَعضهم التَّفْسِير بِالْحَدِيثِ
 مُتَّفق عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 4426
In-book reference : Book 22, Hadith 115