"Water is not made impure by anything."

See the following versions.
Sunan an-Nasa'i Book 2, Hadith 1
← Previous Hadith "You did the right thing." Another man became Junub and performed Tayammum and prayed, and he came to him and he said something similar to what he had told the other man - meaning, you did the right thing.

Sunan an-Nasa'i Book 1, Hadith 325 Next Hadith → "It was said: 'O Messenger of Allah, you perform Wudu' from the well into which the bodies of dogs, menstrual rags and garbage are thrown?' He said: 'Water is pure and it is not made impure by anything.'"

Sunan an-Nasa'i Book 2, Hadith 2