Sahih al-Bukhari 5921

Arabic

حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى بْنِ عَبْدِ اللَّهِ بْنِ أَنَسِ بْنِ مَالِكٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ دِينَارٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الْقَزَعِ‏.‏

English translation

Narrated (Abdullah) bin `Umar:Allah's Messenger (ﷺ) forbade Al-Qaza' (leaving a tuft of hair here and there after shaving one's head)

Reference: Sahih al-Bukhari 5921, Book of Dress. English translation by Dr. Muhammad Muhsin Khan.