Sahih al-Bukhari 2919
صحيح البخاري#2919SahihNarrated Anas:The Prophet (ﷺ) allowed `Abdur-Rahman bin `Auf and Az-Zubair to wear silken shirts because they had a skin disease causing itching
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 56:132