Sunan Abi Dawud 4193
سنن أبي داود#4193SahihNarrated Ibn 'Umar:The Messenger of Allah (ﷺ) forbade qaza'. Qaza' means having part of a boy's head shaved and leaving part unshaven
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Bukhari (5920) Sahih Muslim (2120)
In-book reference: 35:35