There were fifty prayers (obligatory in the beginning); and (in the beginning of Islam) washing seven times because of sexual defilement (was obligatory); and washing the urine from the cloth seven times (was obligatory). The Apostle of Allah ﷺ kept on praying to Allah until the number of prayers was reduced to five and washing because of sexual defilement was allowed only once and washing the urine from the clothe was also permitted only once.  

كَانَتِ الصَّلاَةُ خَمْسِينَ وَالْغُسْلُ مِنَ الْجَنَابَةِ سَبْعَ مِرَارٍ وَغَسْلُ الْبَوْلِ مِنَ الثَّوْبِ سَبْعَ مِرَارٍ فَلَمْ يَزَلْ رَسُولُ اللَّهِ ﷺ يَسْأَلُ حَتَّى جُعِلَتِ الصَّلاَةُ خَمْسًا وَالْغُسْلُ مِنَ الْجَنَابَةِ مَرَّةً وَغَسْلُ الْبَوْلِ مِنَ الثَّوْبِ مَرَّةً  

There were fifty prayers (obligatory in the beginning); and (in the beginning of Islam) washing seven times because of sexual defilement (was obligatory); and washing the urine from the cloth seven times (was obligatory). The Apostle of Allah ﷺ kept on praying to Allah until the number of prayers was reduced to five and washing because of sexual defilement was allowed only once and washing the urine from the clothe was also permitted only once. (Using translation from Abū Dāʾūd 247)   

كَانَتِ الصَّلَاةُ خَمْسِينَ وَالْغُسْلُ مَنَ الْجَنَابَةِ سَبْعَ مِرَارٍ وَغَسْلُ الثَّوْبِ مِنَ الْبَوْلِ سَبْعَ مِرَارٍ فَلَمْ يَزَلْ رَسُولُ اللهِ ﷺ يَسْأَلُ حَتَّى جُعِلَتِ الصَّلَاةُ خَمْسًا وَالْغُسْلُ مِنَ الْجَنَابَةِ مَرَّةً وَغَسْلُ الثَّوْبِ مَنَ الْبَوْلِ مَرَّةً  

[Machine] The prayer was fifty times and washing from sexual impurity was seven times, and washing clothes from urine was seven times. But the Messenger of Allah ﷺ kept asking until he made the prayer five times, and washing from sexual impurity once, and washing clothes from urine once. Ash-Shafi'i said about what was narrated from him, "As for what is narrated from the Prophet ﷺ that there is impurity under every hair, so wash the hair and clean the skin, for it is not confirmed."  

كَانَتِ الصَّلَاةُ خَمْسِينَ وَالْغُسْلُ مِنَ الْجَنَابَةِ سَبْعَ مِرَارٍ وَغَسْلُ الثَّوْبِ مِنَ الْبَوْلِ سَبْعَ مِرَارٍ فَلَمْ يَزَلْ رَسُولُ اللهِ ﷺ يَسْأَلُ حَتَّى جَعَلَ الصَّلَاةَ خَمْسًا وَغُسْلَ الْجَنَابَةِ مَرَّةً وَغَسْلَ الثَّوْبِ مِنَ الْبَوْلِ مَرَّةً قَالَ الشَّافِعِيُّ فِيمَا حُكِيَ عَنْهُ فَأَمَّا مَا رُوِيَ عَنِ النَّبِيِّ ﷺ تَحْتَ كُلِّ شَعْرَةٍ جَنَابَةٌ فَبُلُّوا الشَّعْرَ وَأَنْقُوا الْبَشَرَةَ فَإِنَّهُ لَيْسَ بِثَابِتٍ يَعْنِي