The Book of Pilgrimage
15/10. Chapter:
It is permissible for a Muhrim to shave his head if there is a problem, but it is obligatory to offer a Fidyah for shaving it, and Clarifying what the Fidyah is
Sahih Muslim
حَدَّثَنِي عَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ، وَزُهَيْرُ بْنُ حَرْبٍ، وَيَعْقُوبُ بْنُ إِبْرَاهِيمَ، جَمِيعًا عَنِ ابْنِ عُلَيَّةَ، عَنْ أَيُّوبَ، فِي هَذَا الإِسْنَادِ . بِمِثْلِهِ .
This hadith is narrated on the authority of Ayyub.
Reference : Sahih Muslim 1201bIn-book reference : Book 15, Hadith 88USC-MSA web (English) reference : Book 7, Hadith 2733