Hadith.809 - It was narrated from Dawud al-Sarmi that
a man asked Abu al-Hasan al-Thalith (Imam Ali ibn Muhammad Al-Hadi (as)), about praying in silk (khazz) that is mixed with rabbit fur.
The Imam wrote in response: "That is permissible."
Al-Kāfi #1558“Once I was in the presence of abu ‘Abd Allah (a.s.), when a man of al-Khazzazin came and said, ‘I pray to Allah to keep my soul in service...