"A man passed by the Prophet while he was urinating, and greeted him by the Salam. The Messenger of Allah said to him: "If you see me in this situation, do not greet me with the Salam, for if you do that I will not respond to you.'"
Sunan Ibn Majah Book 1, Hadith 86
← Previous Hadith "A man passed by the Prophet while he was urinating, and greeted him with the Salam, but he did not return the greeting. While he finished, he struck the ground with his palms and did dry ablution (Tayammum), then he returned the greeting."

Sunan Ibn Majah Book 1, Hadith 85 Next Hadith → "A man passed by the Prophet while he was urinating and greeted him with the Salam, and he did not return the greeting."

Sunan Ibn Majah Book 1, Hadith 87