Water; Its Purity and Impurity
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 2
وَ رَوَى إِسْحَاقُ بْنُ عَمَّارٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ أَنَّ أَبَا جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ كَانَ يَقُولُ: «لاَ بَأْسَ بِسُؤْرِ اَلْفَأْرَةِ إِذَا شَرِبَتْ مِنَ اَلْإِنَاءِ أَنْ تَشْرَبَ مِنْهُ أَوْ تَتَوَضَّأَ مِنْهُ.
Ishaq ibn Ammar reported from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام that Imam Muhammad ibn Ali Al-Baqir عليه السلام used to say: "There is no harm in using the leftover water from which a mouse has drunk, for drinking or performing ablution."
- Ṣaḥīḥ al-Faqīh, p. 23