Mishkat al-Masabih #452
Purification
Abu Sa'id al-Khudri said that God's messenger was asked about the purity of the cisterns between Mecca and Medina to which beasts of prey, dogs and asses go down, and replied, “They have what they carry in their bellies, and we have what is left as pure water.”
Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #452 from Mishkat al-Masabih, in the Book of Purification. Mishkat al-Masabih contains 4,428 hadiths across 25 books.