كُنْتُ مَعَ النَّبِيِّ صلى الله عليه وسلم فِي سَفَرٍ فَقَالَ " يَا مُغِيرَةُ، خُذِ الإِدَاوَةَ ". فَأَخَذْتُهَا فَانْطَلَقَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى تَوَارَى عَنِّي فَقَضَى حَاجَتَهُ، وَعَلَيْهِ جُبَّةٌ شَأْمِيَّةٌ، فَذَهَبَ لِيُخْرِجَ يَدَهُ مِنْ كُمِّهَا فَضَاقَتْ، فَأَخْرَجَ يَدَهُ مِنْ أَسْفَلِهَا، فَصَبَبْتُ عَلَيْهِ فَتَوَضَّأَ وُضُوءَهُ لِلصَّلاَةِ، وَمَسَحَ عَلَى خُفَّيْهِ، ثُمَّ صَلَّى.
Al-Mughirah ibn Shu'bah reported: I was with the Prophet ﷺ on a journey, and he said, “O Mughirah, take the leather vessel of water.” I took it. The Messenger of Allah ﷺ went off until he was hidden from me and relieved himself. He was …
also in Sahih al-Bukhari 206, Sahih al-Bukhari 388