(31) باب كَرَاهَةِ الْقَزَعِ .
Ibn Umar reported that Allah's Messenger (ﷺ) forbade Qaza. I said to Nafi:
What is Qaza'? He said: This means having a part of a boy's head shaved and leaving a part unshaven.
Reference: Sahih Muslim 2120 a
In-book reference: Book 37, Hadith 169
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5289