وعنه قال: رأى رسول الله صلى الله عليه وسلم صبيًا قد حلق بعض شعر رأسه وترك بعضه فنهاهم عن ذلك وقال: «احلقوه كله، أو اتركوه كله»
The Messenger of Allah (sallallahu alayhi wa sallam) saw a boy, some portion of whose head was shaved and some of it was left out. He prohibited them from that and said, “Shave the whole of it or leave the whole of it.”.
Riyad as-Salihin 1639, Book 18, The Book of the Prohibited actions, Hadith 129. 1 min read