وَعَنْ أَنَسٍ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رَخَّصَ لِعَبْدِ اَلرَّحْمَنِ بْنِ عَوْفٍ، وَالزُّبَيْرِ فِي قَمِيصِ اَلْحَرِيرِ، فِي سَفَرٍ، مِنْ حَكَّةٍ كَانَتْ بِهِمَا»
The Prophet (sallallahu alayhi wa sallam) gave permission to Abdur-Rahman ibn Auf and Az-Zubayr to wear silk during the journey because of an itching which they suffered from.