Al-Kāfi

Hadith 39
wuduwater-purity
3ـ أَبُو دَاوُدَ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ أَخِيهِ الْحَسَنِ عَنْ زُرْعَةَ عَنْ سَمَاعَةَ قَالَ سَأَلْتُهُ هَلْ يُشْرَبُ سُؤْرُ شَيْ‏ءٍ مِنَ الدَّوَابِّ وَيُتَوَضَّأُ مِنْهُ قَالَ فَقَالَ أَمَّا الإِبِلُ وَالْبَقَرُ وَالْغَنَمُ فَلاَ بَأْسَ.
3. Abu Dawud has narrated from al-Husayn ibn Sa‘id from his brother al-Hassan from Zur’ah, from Sama‘ah who has said the following: “I once asked him (the Imam) (a.s.), ‘Is it permissible to use for Wudu’ the leftover water from which animals have drunk?’ He (the Imam) replied, ‘As far as the camel, cow and sheep are concerned, it is permissible.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī