أَخْبَرَنَا إِسْحَاق ، حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ ، حَدَّثَنِي أَبِي ، عَنْ قَتَادَةَ ، عَنْ الْحَسَنِ ، عَنْ الْحُضَيْنِ ، عَنِ الْمُهَاجِرِ بْنِ قُنْفُذٍ : أَنَّهُ سَلَّمَ عَلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُوَ يَبُولُ،" فَلَمْ يَرُدَّ عَلَيْهِ السَّلَامَ حَتَّى تَوَضَّأَ، فَلَمَّا تَوَضَّأَ، رَدَّهُ عَلَيْهِ "

Ishaq told us, Muadh bin Hisham told us, my father told me, on the authority of Qatada, on the authority of Al-Hasan, on the authority of Al-Hudayn, on the authority of Al-Muhajir bin Qunfud: He greeted the Prophet, may God bless him and grant him peace, while he was urinating, and he did not return the greeting to him until he performed ablution, so when he performed ablution, he returned it to him.