١٣ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ أَحْمَدَ بْنِ الْحَسَنِ بْنِ عَلِيٍّ عَنْ عَمْرِو بْنِ سَعِيدٍ عَنْ مُصَدِّقِ بْنِ صَدَقَةَ عَنْ عَمَّارٍ السَّابَاطِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ سَأَلْتُهُ عَنْ حَدِّ الطِّينِ الَّذِي لاَ يُسْجَدُ فِيهِ مَا هُوَ قَالَ إِذَا غَرِقَ الْجَبْهَةُ وَلَمْ تَثْبُتْ عَلَى الأرْضِ وَعَنِ الرَّجُلِ يُصَلِّي بَيْنَ الْقُبُورِ قَالَ لاَ يَجُوزُ ذَلِكَ إِلاَّ أَنْ يَجْعَلَ بَيْنَهُ وَبَيْنَ الْقُبُورِ إِذَا صَلَّى عَشَرَةَ أَذْرُعٍ مِنْ بَيْنِ يَدَيْهِ وَعَشَرَةَ أَذْرُعٍ مِنْ خَلْفِهِ وَعَشَرَةَ أَذْرُعٍ عَنْ يَمِينِهِ وَعَشَرَةَ أَذْرُعٍ عَنْ يَسَارِهِ ثُمَّ يُصَلِّي إِنْ شَاءَ.
13. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ahmad ibn al-Hassan ibn Ali from ‘Amr ibn Sa‘id from Musaddiq ibn Sadaqah from ‘Ammar al-Sabatiy who has said the following: “I once asked abu ’Abd Allah , about what is clay on which Sajdah (prostration) cannot be performed. He (the Imam) said, ‘Clay is that on which one’s forehead sinks lower and lower without remaining in one place on earth.’ I asked about a man who performs Salah (prayer) on graves. He (the Imam) said, ‘It is not permissible unless he places something between himself and the graves when performing Salah (prayer), like a distance of ten yards from his front side and from his back side, ten yards from the right and ten yards from the left; then he can perform Salah (prayer) if he wanted.’” 