Sahih al-Bukhari 239
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."
وَبِإِسْنَادِهِ قَالَ ‏
"‏ لاَ يَبُولَنَّ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ الَّذِي لاَ يَجْرِي، ثُمَّ يَغْتَسِلُ فِيهِ ‏"‏‏.‏