7ـ 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.’”
