وَ سَأَلَ إِسْمَاعِيلُ بْنُ عِيسَى أَبَا اَلْحَسَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلْجُلُودِ وَ اَلْفِرَاءِ يَشْتَرِيهِ اَلرَّجُلُ فِي سُوقٍ مِنْ أَسْوَاقِ اَلْجَبَلِ أَ يَسْأَلُ عَنْ ذَكَاتِهِ إِذَا كَانَ اَلْبَائِعُ مُسْلِماً غَيْرَ عَارِفٍ قَالَ عَلَيْهِ اَلسَّلاَمُ «عَلَيْكُمْ أَنْ تَسْأَلُوا عَنْهُ إِذَا رَأَيْتُمُ اَلْمُشْرِكِينَ يَبِيعُونَ ذَلِكَ وَ إِذَا رَأَيْتُمُوهُمْ يُصَلُّونَ فَلاَ تَسْأَلُوا عَنْهُ.
Ismail ibn Isa asked Abu Al-Hasan al-Ridha about leather and fur items purchased from a market in the mountain regions: Should a person inquire about their source of slaughter (i.e., whether it was properly done) if the seller is a Muslim but not a known believer? He (a.s) replied: "You should inquire if you see that the sellers are polytheists selling those items. But if you see them performing prayer, then you do not need to ask”.