811. hadíth
وَ كَتَبَ إِلَيْهِ: فِي اَلرَّجُلِ يَجْعَلُ فِي جُبَّتِهِ بَدَلَ اَلْقُطْنِ قَزّاً هَلْ يُصَلِّي فِيهِ فَكَتَبَ «نَعَمْ لاَ بَأْسَ بِهِ."
He (Ibrahim ibn Mahziyar) wrote to Imam Abu Muhammad al-Hasan (a.s) asking about a man who replaces cotton in his cloak with qazz (a type of silk): "Can he pray in it?" Imam (a.s) replied: "Yes, there is no problem with it."