Sahih Muslim | Book 24 | Hadith Number 5168

Narrated by Anas b. Malik
Anas b. Malik reported to them (his companions) that Allah's Messenger (may peace be upon him) had granted concession to Abd al-Rahman b. *Anf and Zubair b. 'Awwam for the wearing of a silk shirt during the journey and because of itch which they both had or any other disease from which both of them had been suffering.