Al-Kāfi

Hadith 25
water-purity
5ـ أَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ سَالِمٍ عَنْ أَحْمَدَ بْنِ النَّضْرِ عَنْ عَمْرِو بْنِ شِمْرٍ عَنْ جَابِرٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) فِي السَّامِّ أَبْرَصَ يَقَعُ فِي الْبِئْرِ قَالَ لَيْسَ بِشَيْ‏ءٍ حَرِّكِ الْمَاءَ بِالدَّلْوِ.
5. Ahmad ibn Idris has narrated from Muhammad ibn Salim from Ahmad ibn al-Nadr from ‘Amr ibn Shimr from Jabir who has said the following: “This is about the case of al-Sam al-Abras (a poisonous snake) that falls in the well. Abu Ja‘far (a.s.), has said, ‘It is not harmful. Just stir the water with the bucket.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī