(14) باب فِي الذُّؤَابَةِ
Narrated Abdullah ibn Umar:
the Prophet (ﷺ) forbade qaza' which means that the head of a boy is shaved and a lock is left.
Reference: Sunan Abi Dawud 4194
In-book reference: Book 35, Hadith 36
English translation: Book 34, Hadith 4182