Sahih Muslim Book - 5, Hadith - 1368

وَحَدَّثَنِى زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ حَدَّثَنَا أَبُو عَمْرٍو - يَعْنِى الأَوْزَاعِىَّ - حَدَّثَنَا الزُّهْرِىُّ عَنْ أَبِى سَلَمَةَ عَنْ أَبِى هُرَيْرَةَ قَالَ أُقِيمَتِ الصَّلاَةُ وَصَفَّ النَّاسُ صُفُوفَهُمْ وَخَرَجَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- فَقَامَ مَقَامَهُ فَأَوْمَأَ إِلَيْهِمْ بِيَدِهِ أَنْ « مَكَانَكُمْ ». فَخَرَجَ وَقَدِ اغْتَسَلَ وَرَأْسُهُ يَنْطِفُ الْمَاءَ فَصَلَّى بِهِمْ.

It was narrated that Abu Hurairah said: "The Iqamah for prayer was called, and the people had lined up in rows. The Messenger of Allah (s.a.w) came out and stood in his place, then he gestured to them with his hand to stay where they were. Then he came out and he had performed Ghusl, and his head was dripping with water, and he led them in prayer."