Not graded
Bulugh al-Maram 6b
وَلِلْبُخَارِيِّ: { لَا يَبُولَنَّ أَحَدُكُمْ فِي اَلْمَاءِ اَلدَّائِمِ اَلَّذِي لَا يَجْرِي, ثُمَّ يَغْتَسِلُ فِيهِ } 1 . وَلِمُسْلِمٍ:
"مِنْهُ"
Another version of Al-Bukhari has:
“None of you should urinate in stagnant water that is not flowing, and then take bath in it”. A version of Muslim has the words “from it (i.e. the water)”. A version of Abu Da’ud has: “One should not take bath in it from sexual impurity”.
Cited in Bulugh al-Maram (No. 6b).