Sunan an-Nasa'i 5051
سنن النسائي#5051Sahihأَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا أَبُو دَاوُدَ، عَنْ سُفْيَانَ، عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رضى الله عنهما قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنِ الْقَزَعِ . قَالَ أَبُو عَبْدِ الرَّحْمَنِ حَدِيثُ يَحْيَى بْنِ سَعِيدٍ وَمُحَمَّدِ بْنِ بِشْرٍ أَوْلَى بِالصَّوَابِ .
It was narrated that Ibn 'Umar said:"The Messenger of Allah [SAW] forbade Al-Qaza' (to shave part of the head and leave part)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 48:12