Sahih al-Bukhari 1729
Sahih al-Bukhari · Book 25: Hajj (Pilgrimage) · To shave the head and to have the head-hair cut short on finishing the Ihram
Narrated `Abdullah:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ أَسْمَاءَ ، حَدَّثَنَا جُوَيْرِيَةُ بْنُ أَسْمَاءَ ، عَنْ نَافِعٍ ، أَنَّ عَبْدَ اللَّهِ ، قَالَ حَلَقَ النَّبِيُّ صلى الله عليه وسلم وَطَائِفَةٌ مِنْ أَصْحَابِهِ، وَقَصَّرَ بَعْضُهُمْ.
The Prophet (ﷺ) and some of his companions got their heads shaved and some others got their hair cut short.