809. hadíth
وَ رُوِيَ عَنْ دَاوُدَ اَلصَّرْمِيِّ أَنَّهُ قَالَ: سَأَلَ رَجُلٌ أَبَا اَلْحَسَنِ اَلثَّالِثَ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلصَّلاَةِ فِي اَلْخَزِّ يُغَشُّ بِوَبَرِ اَلْأَرَانِبِ فَكَتَبَ «يَجُوزُ ذَلِكَ.
It was narrated from Dawud al-Sarmi that a man asked Abu al-Hasan al-Thalith (Imam Ali ibn Muhammad Al-Hadi (a.s)), about praying in silk (khazz) that is mixed with rabbit fur. The Imam wrote in response: "That is permissible."