Man Lā Yaḥḍuruh al-Faqīh
Hadith 10114224 - وَ رَوَى حَنَانُ بْنُ سَدِيرٍ عَنْ بُرْدٍ اَلْإِسْكَافِ قَالَ : قُلْتُ لِأَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ إِنِّي رَجُلٌ خَرَّازٌ وَ لاَ يَسْتَقِيمُ عَمَلُنَا إِلاَّ بِشَعْرِ اَلْخِنْزِيرِ نَخْرُزُ بِهِ قَالَ "خُذْ مِنْهُ وَبَرَةً فَاجْعَلْهَا فِي فَخَّارَةٍ ثُمَّ أَوْقِدْ تَحْتَهَا حَتَّى تُذْهِبَ دَسَمَهُ ثُمَّ اِعْمَلْ بِهِ".
Hadith.4224 - And Hanan ibn Sadeer narrated from Burd al-Iskafi who said:
I said to Abu Abdullah (as): 'I am a shoemaker, and our work cannot be done without using pig hair to sew with.'
Imam (as) said: 'Take a single bristle from it and place it in a clay pot, then light a fire underneath it until its grease is removed. After that, you may work with it.'"