Messenger of Allah ﷺ went out (of the mosque) when the Iqama had been pronounced and the rows straightened. The Prophet ﷺ stood at his Musalla (praying place) and we waited for the Prophet ﷺ to begin the prayer with Takbir. He left and asked us to remain in our places. We kept on standing till the Prophet returned and the water was trickling from his head for he had taken a bath (of Janaba). (Using translation from Bukhārī 639)
خَرَجَ رَسُولُ اللهِ ﷺ وَقَدْ أُقِيمَتِ الصَّلَاةُ وَعُدِّلَتِ الصُّفُوفُ حَتَّى إِذَا قَامَ فِي مُصَلَّاهُ وَانْتَظَرْنَا أَنْ يُكَبِّرَ انْصَرَفَ فَقَالَ عَلَى مَكَانِكُمْ فَدَخَلَ بَيْتَهُ وَمَكَثْنَا عَلَى هَيْئَتِنَا حَتَّى خَرَجَ إِلَيْنَا يَنْطِفُ رَأْسُهُ وَقَدِ اغْتَسَلَ