It was narrated that Ibn 'Umar said: "A man passed by the Prophet while he was urinating and greeted him with the Salam, and he did not return the greeting."

It was narrated that Muhajir bin Qunfudh bin (Umair) bin Jud'an said: "I came to the Prophet when he was performing ablution and greeted him with the Salam, but he did not return (the greeting). When he had finished his ablution he said: 'Nothing prevented me from returning your greeting but the fact that I need to have ablution.'" (Da'if) Another chain with similar wording.

It was narrated that Abu Hurairah said: "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."

It was narrated from Jabir bin `Abdullah that: "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.'"