Hajj (Pilgrimage)
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.Narrated `Abdullah:The Prophet (ﷺ) and some of his companions got their heads shaved and some others got their hair cut short
From Sahih al-Bukhari, whose reports the scholars accept as authentic.