3. A number of our people have narrated from Sahl ibn Ziyad Ahmad ibn Muhammad from ibn abu Nasr who has said the following: “I once said to abu al-Hassan , ‘Our people narrate that shaving one’s head, except for al-Hajj or al-‘Umrah, is like causing deformity.’ He (the Imam) said, ‘Abu al-Hassan , after al-Hajj and al-‘Umrah would go to the town called Sayah and shave his head.’”