Whenever the Prophet ﷺ took a bath after Janaba he started by washing his hands and then performed ablution like that for the prayer. After that he would put his fingers in water and move the roots of his hair with them, and then pour three handfuls of water over his head and then pour water all over his body. (Using translation from Bukhārī 248)   

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ بَدَأَ فَغَسَلَ يَدَيْهِ ثُمَّ تَوَضَّأَ كَمَا يَتَوَضَّأُ لِلصَّلَاةِ ثُمَّ يُدْخِلُ أَصَابِعَهُ فِي الْمَاءِ فَيُخَلِّلُ بِهَا أُصُولَ شَعْرِهِ ثُمَّ يَصُبُّ عَلَى رَأْسِهِ ثَلَاثَ غُرَفٍ بِيَدِهِ ثُمَّ يُفِيضُ الْمَاءَ عَلَى جِلْدِهِ كُلِّهِ  

(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." (Using translation from Bukhārī 272)   

كَانَ رَسُولُ اللهِ ﷺ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ غَسَلَ يَدَيْهِ وَتَوَضَّأَ وُضُوءَهُ لِلصَّلَاةِ ثُمَّ يُخَلِّلُ بِيَدِهِ شَعْرَهُ حَتَّى إِذَا ظَنَّ أَنَّهُ قَدْ أَرْوَى بَشَرَتَهُ أَفَاضَ عَلَيْهِ الْمَاءَ ثَلَاثَ مَرَّاتٍ ثُمَّ غَسَلَ سَائِرَ جَسَدِهِ وَقَالَتْ كُنْتُ أَغْتَسِلُ أَنَا وَرَسُولُ اللهِ ﷺ مِنْ إِنَاءٍ وَاحِدٍ نَغْرِفُ مِنْهُ جَمِيعًا  

[Machine] The Prophet ﷺ used to perform ablution from impurity, then he would enter his right hand into the water and rub it on the right side of his head, following the roots of his hair. Then he would do the same with the left side of his head using his left hand. He would continue doing this until he covered his entire scalp. After that, he would pour water over his head three times.  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يَتَوَضَّأُ مِنَ الْجَنَابَةِ ثُمَّ يُدْخِلُ يَدَهُ الْيُمْنَى فِي الْمَاءِ ثُمَّ يُخَلِّلُ بِهَا شِقَّ رَأَسِهِ الْأَيْمَنِ فَيَتْبَعُ بِهَا أُصُولَ الشَّعْرِ ثُمَّ يَفْعَلُ بِشِقِّ رَأْسِهِ الْأَيْسَرِ بِيَدِهِ الْيُسْرَى كَذَلِكَ حَتَّى يَسْتَبْرِئَ الْبَشَرَةَ ثُمَّ يَصُبُّ عَلَى رَأْسِهَا ثَلَاثًا  

I heard the Prophet ﷺ say: ʿWhoever leaves a space the size of a hair when doing ghusl for janabah and does not make water reach it, Allah will punish him with such and such in the Fire.” ‘Ali ؓ said: From that time I disliked my hair. (Using translation from Aḥmad 727)   

سَمِعْتُ النَّبِيَّ ﷺ قَالَ مَنْ تَرَكَ مَوْضِعَ شَعْرَةٍ مِنْ جَسَدِهِ مِنْ جَنَابَةٍ لَمْ يُصِبْهَا الْمَاءُ فُعِلَ بِهِ كَذَا وَكَذَا مِنَ النَّارِ قَالَ عَلِيٌّ فَمِنْ ثَمَّ عَادَيْتُ رَأْسِي قَالَ قَالَ عَبْدُ اللهِ فِي حَدِيثِهِ وَكَانَ يَجُزُّ شَعْرَهُ  

[Machine] The Prophet ﷺ said, "Under every hair is impurity, so wash the hair and clean the skin underneath it." It was narrated by Harith bin Waji'i and Harith bin Waji'i spoke about it.  

أَنَّ النَّبِيَّ ﷺ قَالَ تَحْتَ كُلِّ شَعْرٍ جَنَابَةٌ فَاغْسِلُوا الشَّعْرَ وَأَنْقُوا الْبَشَرَةَ تَفَرَّدَ بِهِ مَوْصُولًا الْحَارِثُ بْنُ وَجِيهٍ وَالْحَارِثُ بْنُ وَجِيهٍ تَكَلَّمُوا فِيهِ  

[Machine] A man came to the Prophet ﷺ and asked him about the news of the sky. The Messenger of Allah ﷺ replied, "Would any of you ask about the news of the sky while he has his fingernails like the claws of a bird? Gathering in it are impurity and filth."  

جَاءَ رَجُلٌ إِلَى النَّبِيِّ ﷺ فَسَأَلَهُ عَنْ خَبَرِ السَّمَاءِ فَقَالَ رَسُولُ اللهِ ﷺ يَسْأَلُ أَحَدُكُمْ عَنْ خَبَرِ السَّمَاءِ وَهُوَ يَدَعُ أَظْفَارَهُ كَأَظْفَارِ الطَّيْرِ يَجْتَمِعُ فِيهِ الْجَنَابَةُ وَالتَّفَثُ لَفْظُ الْأَسْفَاطِيِّ هَكَذَا  

[Machine] A man came to the Prophet ﷺ and asked him. He said: "One of you asks me about news from the sky while he neglects the appearance of his nails, which are like birds' nails. In them, impurity and spittle gather." This is the statement of Abu Ayyub Al-Azdi, not Abu Ayyub Al-Ansari.  

أَتَى رَجُلٌ النَّبِيَّ ﷺ يَسْأَلُهُ فَقَالَ يَسْأَلُنِي أَحَدُكُمْ عَنْ خَبَرِ السَّمَاءِ وَيَدَعُ أَظْفَارَهُ كَأَظْفَارِ الطَّيْرِ يَجْتَمِعُ فِيهَا الْجَنَابَةُ وَالتَّفَثُ وَهَذَا مُرْسَلٌ أَبُو أَيُّوبَ الْأَزْدِيُّ غَيْرُ أَبِي أَيُّوبَ الْأَنْصَارِيِّ