[Machine] Sahl al-Ansari was a companion of the Prophet ﷺ and he had met the Prophet when he was fifteen years old. Ubayy ibn Ka'b told me that the fatwa they used to say, "Water from water is permissible," the Messenger of Allah ﷺ permitted it in the early days of Islam. Then he commanded us to perform ablution after it.
سَهْلٌ الْأَنْصَارِيُّ وَكَانَ قَدْ أَدْرَكَ النَّبِيَّ ﷺ وَهُوَ ابْنُ خَمْسَ عَشْرَةَ فِي زَمَانِهِ حَدَّثَنِي أُبَيُّ بْنُ كَعْبٍ أَنَّ الْفُتْيَا الَّتِي كَانُوا يَقُولُونَ الْمَاءُ مِنَ الْمَاءِ رُخْصَةٌ كَانَ رَسُولُ اللهِ ﷺ رَخَّصَ بِهَا فِي أَوَّلِ الْإِسْلَامِ ثُمَّ أَمَرَنَا بِالِاغْتِسَالِ بَعْدَهَا