Sahih al-Bukhari 5839
Sahih al-Bukhari · Book 77: Dress · Silk is allowed for men suffering from an itch
Narrated Anas:
حَدَّثَنِي مُحَمَّدٌ ، أَخْبَرَنَا وَكِيعٌ ، أَخْبَرَنَا شُعْبَةُ ، عَنْ قَتَادَةَ ، عَنْ أَنَسٍ ، قَالَ رَخَّصَ النَّبِيُّ صلى الله عليه وسلم لِلزُّبَيْرِ وَعَبْدِ الرَّحْمَنِ فِي لُبْسِ الْحَرِيرِ لِحِكَّةٍ بِهِمَا.
The Prophet (ﷺ) allowed Az-Zubair and `Abdur-Rahman to wear silk because they were suffering from an itch.