Sunan an-Nasa'i, Book 48, Hadith 192 (In-Book) ⓘ
It was narrated from Ibn 'Umar that : The Prophet [SAW] forbade Al-Qaza' (shaving part of the head and leaving part)."
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، قَالَ أَخْبَرَنِي عُمَرُ بْنُ نَافِعٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى عَنِ الْقَزَعِ .
also referenced under: Hadith 5231 (Reference) & Volume 6, Book 48, Hadith 5233 (DarusSalam)