(68) باب الْبَوْلِ فِي الْمَاءِ الدَّائِمِ
The same narrator said that the Prophet (ﷺ) had said:
"You should not pass urine in stagnant water which is not flowing then (you may need to) wash in it."
Reference: Sahih al-Bukhari 239
In-book reference: Book 4, Hadith 106
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 240