Sahih Bukhari Volume 1, Book 5, Hadith 275

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ، قَالَ أَخْبَرَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ أُقِيمَتِ الصَّلاَةُ، وَعُدِّلَتِ الصُّفُوفُ قِيَامًا، فَخَرَجَ إِلَيْنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَلَمَّا قَامَ فِي مُصَلاَّهُ ذَكَرَ أَنَّهُ جُنُبٌ فَقَالَ لَنَا ‏:‏ ‏"‏ مَكَانَكُمْ ‏"‏‏.‏ ثُمَّ رَجَعَ فَاغْتَسَلَ، ثُمَّ خَرَجَ إِلَيْنَا وَرَأْسُهُ يَقْطُرُ، فَكَبَّرَ فَصَلَّيْنَا مَعَهُ‏.‏ تَابَعَهُ عَبْدُ الأَعْلَى عَنْ مَعْمَرٍ عَنِ الزُّهْرِيِّ‏.‏ وَرَوَاهُ الأَوْزَاعِيُّ عَنِ الزُّهْرِيِّ‏

Narrated By Abu Huraira : Once the call (Iqama) for the prayer was announced and the rows were straightened. Allah's Apostle came out; and when he stood up at his Musalla, he remembered that he was Junub. Then he ordered us to stay at our places and went to take a bath and then returned with water dropping from his head. He said, "Allahu-Akbar", and we all offered the prayer with him.