"A man passed by the Prophet (ﷺ) when he was urinating and greeted him with Salam, but he did not return his greeting."
Sunan an-Nasa'i Book 1, Hadith 37
← Previous Hadith "None of you should urinate in the place where he bathes, for most Waswas (devilish whispers) come from that."

I.e., with regard to whether the urine has soiled his body or not.

Sunan an-Nasa'i Book 1, Hadith 36 Next Hadith → It was narrated from Al-Muhajir bin Qunfudh that he greeted the Prophet (ﷺ) with Salam while he was urinating, and he did not return the greeting until he had performed Wudu'. When he had performed Wudu' he returned the greeting.

Sunan an-Nasa'i Book 1, Hadith 38