(2) باب التَّوْقِيتِ فِي الْمَاءِ
It was narrated from 'Ubaidullah bin 'Abdullah bin 'Umar that his father said:
"The Messenger of Allah (ﷺ) was asked about water and how some animals and carnivorous beasts might drink from it. He said: 'If the water is more than two Qullahs, it will not become filthy.'"
Reference: Sunan an-Nasa'i 328
In-book reference: Book 2, Hadith 4
English translation: Vol. 1, Book 2, Hadith 329