Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Muhajir bin Qunfudh (may Allah be pleased with him) that he came to the Noble Prophet (peace and blessings be upon him) while he was urinating. He greeted the Prophet (peace and blessings be upon him) with salam, but the Prophet (peace and blessings be upon him) did not reply. First, he performed ablution (then replied and) then said: "I dislike mentioning Allah, the Exalted, without being in a state of ablution."