The Shaykh (Al-Mufid), narrated to me from Abu al-Qasim Ja'far ibn Muhammad, from Muhammad ibn Ya'qub, from Ahmad ibn Idris and Muhammad ibn Yahya, both from Muhammad ibn Ahmad, from Ahmad ibn al-Hasan ibn Ali, from Amr ibn Sa'id, from Musaddiq ibn Sadaqah, from Ammar ibn Musa: Abu Abdullah عليه السلام, was asked about water from which pigeons drink. Imam عليه السلام said: "Everything whose meat is permissible to eat, its leftover water (su’r) can be used for Wudu' (ablution) and drinking."