Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
123. Chapter: On the permission to wear silk if one has the itch
810. Anas said, "The Messenger of Allah, may Allah bless him and grant him peace, made an exception in the case of az-Zubayr and 'Abdu'r-Rahman ibn 'Awf with respect to the wearing of silk because of the itch they had." [Agreed upon]
