832 - وَ سَأَلَ اَلْمُعَلَّى بْنُ خُنَيْسٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلصَّلاَةِ عَلَى اَلْقُفْرِ وَ اَلْقِيرِ فَقَالَ «لاَ بَأْسَ بِهِ.
Hadith.832 - Al-Mu'alla ibn Khunays asked Imam Jafar ibn Muhammad Al-Sadiq 
about praying on qufr (bare ground or desert soil) and qīr (a type of tar or pitch).
Imam said: "There is no issue with it”.
