أَخْبَرَنَا نَصْرُ بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم رَخَّصَ لِعَبْدِ الرَّحْمَنِ وَالزُّبَيْرِ فِي قُمُصِ حَرِيرٍ كَانَتْ بِهِمَا يَعْنِي لِحِكَّةٍ ‏.‏

It was narrated from Anas that: The Prophet [SAW] granted a concession to 'Abdur-Rahman and Az-Zubair to wear silken shirts because of scabies that they were suffering from. Translation Not Available

Book Ref: Sunan An Nisai Book 48 Hadith 5311
Web Ref:  Sunan An Nisai Vol 6 Book 48 Hadith 5313