Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5230 (DarusSalam) ⓘ
It was narrated from Ibn 'Umar that: The Prophet [SAW] forbade Al-Qaza' (shaving part of the head and leaving part).
أَخْبَرَنَا أَحْمَدُ بْنُ عَبْدَةَ، قَالَ أَنْبَأَنَا حَمَّادٌ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى عَنِ الْقَزَعِ .
also referenced under: Hadith 5228 (Reference) & Book 48, Hadith 189 (In-Book)