Sahih Bukhari
Patients
Volume: 007 / Book Number: 070 / Hadith Number: 569
Narrated Ka'b bin 'Ujara:
The Prophet passed by me while I was kindling a fire under a (cooking) pot. He said, "Do the lice of your head trouble you?" I said, "Yes." So he called a barber to shave my head and ordered me to make expiation for that."