1. Purification
١۔ كِتَابُ الطَّهَارَةِ
It was narrated from Abu Hurairah that the Messenger of Allah ﷺ forbade urinating into standing water then performing Ghusl with it. (Using translation from Nasāʾī 399)
أَنَّ رَسُولَ اللهِ ﷺ «نَهَى أَنْ يَبُولَ الرَّجُلُ فِي الْمَاءِ الرَّاكِدِ ثُمَّ يَغْتَسِلُ مِنْهُ»