Abu Hurairah reported:

The prayer (in congregation) began and people stood in their rows. The Messenger of Allah (ﷺ) came out (from his residence). When he stood at his proper place he recalled that he did not take a bath. He then said to the people: (Remain standing) at your places. Then he returned to his house and came out upon us after taking a bath while the drops of water were coming down from his head. We were standing in the rows (of prayer). This is the version of Ibn Harb. ‘Ayyash reported in his version: we kept on waiting for him while we were standing until he came upon us after he had taken a bath.

حَدَّثَنَا عَمْرُو بْنُ عُثْمَانَ، حَدَّثَنَا مُحَمَّدُ بْنُ حَرْبٍ، حَدَّثَنَا الزُّبَيْدِيُّ، ح وَحَدَّثَنَا عَيَّاشُ بْنُ الأَزْرَقِ، أَخْبَرَنَا ابْنُ وَهْبٍ، عَنْ يُونُسَ، ح وَحَدَّثَنَا مَخْلَدُ بْنُ خَالِدٍ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ خَالِدٍ، - إِمَامُ مَسْجِدِ صَنْعَاءَ - حَدَّثَنَا رَبَاحٌ، عَنْ مَعْمَرٍ، ح وَحَدَّثَنَا مُؤَمَّلُ بْنُ الْفَضْلِ، حَدَّثَنَا الْوَلِيدُ، عَنِ الأَوْزَاعِيِّ، كُلُّهُمْ عَنِ الزُّهْرِيِّ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ أُقِيمَتِ الصَّلاَةُ وَصَفَّ النَّاسُ صُفُوفَهُمْ فَخَرَجَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى إِذَا قَامَ فِي مَقَامِهِ ذَكَرَ أَنَّهُ لَمْ يَغْتَسِلْ فَقَالَ لِلنَّاسِ ‏

‏ مَكَانَكُمْ ‏

‏ ‏.‏ ثُمَّ رَجَعَ إِلَى بَيْتِهِ فَخَرَجَ عَلَيْنَا يَنْطُفُ رَأْسُهُ وَقَدِ اغْتَسَلَ وَنَحْنُ صُفُوفٌ ‏.‏ وَهَذَا لَفْظُ ابْنِ حَرْبٍ وَقَالَ عَيَّاشٌ فِي حَدِيثِهِ فَلَمْ نَزَلْ قِيَامًا نَنْتَظِرُهُ حَتَّى خَرَجَ عَلَيْنَا وَقَدِ اغْتَسَلَ ‏.‏