The Book Pertaining to Clothes and Decoration (Kitab Al-Libas wa'l-Zinah)

Muslim :: Book 24 : Hadith 5289

Ibn Umar reported that Allah's Messenger (may peace be upon him) 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.