٧ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْبَرْقِيِّ عَنِ ابْنِ سِنَانٍ عَنْ إِسْمَاعِيلَ بْنِ جَابِرٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الْمَاءِ الَّذِي لاَ يُنَجِّسُهُ شَيْ‏ءٌ قَالَ كُرٌّ قُلْتُ وَمَا الْكُرُّ قَالَ ثَلاَثَةُ أَشْبَارٍ فِي ثَلاَثَةِ أَشْبَارٍ.
7. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Barqiy from ibn Sinan from ’Isma‘il ibn Jabir who has said the following: “I asked abu ‘Abd Allah , about the water which does not become unclean by anything. He (the Imam) replied, ‘It is one Kur.’ I then asked, ‘How much is one Kur?’ He (the Imam) replied, ‘It is three shibr by three shibr in size.’” 