(on the authority of his father) ʿAisha said, "Whenever Messenger of Allah ﷺ took the bath of Janaba, he cleaned his hands and performed ablution like that for prayer and then took a bath and rubbed his hair, till he felt that the whole skin of the head had become wet, then he would pour water thrice and wash the rest of the body." ʿAisha further said, "I and Messenger of Allah ﷺ used to take a bath from a single water container, from which we took water simultaneously."
كَانَ رَسُولُ اللَّهِ ﷺ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ غَسَلَ يَدَيْهِ وَتَوَضَّأَ وُضُوءَهُ لِلصَّلاَةِ ثُمَّ اغْتَسَلَ ثُمَّ يُخَلِّلُ بِيَدِهِ شَعَرَهُ حَتَّى إِذَا ظَنَّ أَنْ قَدْ أَرْوَى بَشَرَتَهُ أَفَاضَ عَلَيْهِ الْمَاءَ ثَلاَثَ مَرَّاتٍ ثُمَّ غَسَلَ سَائِرَ جَسَدِهِ وَقَالَتْ كُنْتُ أَغْتَسِلُ أَنَا وَرَسُولُ اللَّهِ ﷺ مِنْ إِنَاءٍ وَاحِدٍ نَغْرِفُ مِنْهُ جَمِيعًا