١٣ـ أَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ أَحْمَدَ بْنِ الْحَسَنِ عَنْ عَمْرِو بْنِ سَعِيدٍ عَنْ مُصَدِّقِ بْنِ صَدَقَةَ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ سَأَلْتُهُ عَنِ الْمَرِيضِ أَ يَحِلُّ لَهُ أَنْ يَقُومَ عَلَى فِرَاشِهِ وَيَسْجُدَ عَلَى الأرْضِ قَالَ فَقَالَ إِذَا كَانَ الْفِرَاشُ غَلِيظاً قَدْرَ آجُرَّةٍ أَوْ أَقَلَّ اسْتَقَامَ لَهُ أَنْ يَقُومَ عَلَيْهِ وَيَسْجُدَ عَلَى الأرْضِ وَإِنْ كَانَ أَكْثَرَ مِنْ ذَلِكَ فَلاَ. 
13. Ahmad ibn Idris has narrated from Muhammad ibn Ahmad from Ahmad ibn al-Hassan from ‘Amr ibn Sa‘id from Musaddiq ibn Sadaqah who has said the following: “I once asked abu ‘Abd Allah , about a man who suffers from an illness: if it is permissible to stand up on his floor furnishing and perform Sajdah (prostration) on earth. He (the Imam) said, ‘If the furnishing is thick of the size of a brick or less, he can stand up on it and perform Sajdah (prostration) on earth, but if it is more than that, then it is not permissible.’” 