Sunan an-Nasa'i, Hadith 5311 ⓘ
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.
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 .
also referenced under: Book 48, Hadith 272 (In-Book) & Volume 6, Book 48, Hadith 5313 (DarusSalam)