Al-Husayn b. Ibrahim b. Natana narrated to us. He said: `Ali b. Ibrahim narrated to us from his father from Muhammad b. Abi `Umayr from Hafs b. al-Bakhtari from Abi `Abdillah al-Sadiq . He said:

Cutting the fingernails and trimming the mustache from Friday to Friday is a protection from leprosy.