Muhajir bin Qunfudh reported that he came upon the Prophet ﷺ while he was urinating, or had just urinated, and greeted him with the salaam. The Prophet ﷺ did not return the greeting until he had performed wudu, and then he returned it.
حدثنا عفان حدثنا حماد عن حميد عن الحسن
أن النبي ﷺ كان يبول أو قد بال فسلمت عليه فلم يرد علي حتى توضأ ثم رد علي