Sahih al-Bukhari 239

Ablutions (Wudu')

#239Book 4

وَبِإِسْنَادِهِ قَالَ ‏ "‏ لاَ يَبُولَنَّ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ الَّذِي لاَ يَجْرِي، ثُمَّ يَغْتَسِلُ فِيهِ ‏"‏‏.‏

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
Book 4, Hadith 105
English
Muhsin Khan