٤ـ أَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ عَبَّادِ بْنِ سُلَيْمَانَ عَنْ سَعْدِ بْنِ سَعْدٍ عَنْ مُحَمَّدِ بْنِ الْقَاسِمِ عَنْ أَبِي الْحَسَنِ (عَلَيْهِ الْسَّلام) فِي الْبِئْرِ يَكُونُ بَيْنَهَا وَبَيْنَ الْكَنِيفِ خَمْسَةُ أَذْرُعٍ أَوْ أَقَلُّ أَوْ أَكْثَرُ يُتَوَضَّأُ مِنْهَا قَالَ لَيْسَ يُكْرَهُ مِنْ قُرْبٍ وَلاَ بُعْدٍ يُتَوَضَّأُ مِنْهَا وَيُغْتَسَلُ مَا لَمْ يَتَغَيَّرِ الْمَاءُ. 
4. Ahmad ibn Idris has narrated from Muhammad ibn Ahmad from ‘Abbad ibn Sulayman from Sa‘d ibn Sa‘d from Muhammad ibn al- Qasim who has said the following: “I once asked abu al-Hassan , about a well which is five yards or more or less away from a cesspool. Can it be used for Wudu’? He (the Imam) said, ‘Shortness or length of distance does not matter. It can be used for Wudu’ or Ghusl (bath) if the water has not changed.’” 