The verdict that water (bath) is necessary when there is emission given by the people (in the early days of Islam) was due to the concession granted by the Messenger of Allah in the beginning of Islam. He then commanded to take a bath (in such a case). Abu Dawud said : By Abu Ghassan is meant Muhammad b. mutarrif.  

أَنَّ الْمَاءَ مِنَ الْمَاءِ كَانَتْ رُخْصَةً رَخَّصَهَا رَسُولُ اللَّهِ ﷺ فِي بَدْءِ الإِسْلاَمِ ثُمَّ أَمَرَ بِالاِغْتِسَالِ بَعْدُ  

"That was a concession that was granted in the early days of Islam, then we were commanded to have a bathe after that."  

إِنَّمَا كَانَتْ رُخْصَةً فِي أَوَّلِ الإِسْلاَمِ ثُمَّ أُمِرْنَا بِالْغُسْلِ بَعْدُ  

[Machine] "The fatwa that they used to issue, regarding 'water from water', was a permission that the Messenger of Allah ﷺ granted in the early days of Islam or at that time, then he performed ablution afterwards."  

أَنَّ الْفُتْيَا الَّتِي كَانُوا يُفْتَوْنَ بِهَا «الْمَاءُ مِنَ الْمَاءِ» كَانَتْ رُخْصَةً رَخَّصَهَا رَسُولُ اللَّهِ ﷺ فِي أَوَّلِ الْإِسْلَامِ أَوِ الزَّمَانِ ثُمَّ اغْتَسَلَ بَعْدُ  

The verdict that water (bath) is necessary when there is emission given by the people (in the early days of Islam) was due to the concession granted by the Messenger of Allah in the beginning of Islam. He then commanded to take a bath (in such a case). Abu Dawud said : By Abu Ghassan is meant Muhammad b. mutarrif. (Using translation from Abū Dāʾūd 215)   

«أَنَّ الْمَاءَ مِنَ الْمَاءِ كَانَ رُخْصَةً رَخَّصَهَا رَسُولُ اللَّهِ ﷺ فِي أَوَّلِ الزَّمَانِ أَوْ بَدْءِ الْإِسْلَامِ ثُمَّ أَمَرَ بِالِاغْتِسَالِ بَعْدُ»  

[Machine] It was narrated that water was considered permissible at the beginning of Islam, and the Messenger of Allah ﷺ made it easy. Then he ordered us to perform ablution. And in the narration of Musa bin Harun, he ordered us to perform ablution afterwards.  

أَنَّ الْمَاءَ مِنَ الْمَاءِ كَانَتْ رُخْصَةً رَخَّصَهَا رَسُولُ اللهِ ﷺ فِي بَدْءِ الْإِسْلَامِ ثُمَّ أَمَرَ بِالِاغْتِسَالِ بَعْدُ وَفِي حَدِيثِ مُوسَى بْنِ هَارُونَ ثُمَّ أَمَرَنَا بِالِاغْتِسَالِ بَعْدُ  

"إِنَّ الْفُتْيَا الَّتِى كَانُوا يُفْتُونَ أَنَّ الْمَاءَ مِنَ الْمَاءِ كَانتْ رُخْصَةً رَخَّصَهَا رَسُولُ الله ﷺ فِى بَدْءِ الإِسْلاَمِ، ثُمَّ أَمَرَ بِالاغْتِسَالِ بَعْدُ".