836 - وَ سَأَلَ مُعَاوِيَةُ بْنُ عَمَّارٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلصَّلاَةِ عَلَى اَلْقَارِ فَقَالَ «لاَ بَأْسَ بِهِ.
Hadith.836 - Muawiya ibn Ammar asked Imam Jafar ibn Muhammad Al-Sadiq 
about praying on qār (bitumen or tar).
The Imam said: "There is no issue with it”.
