Authentic
hadith of Sahih al-Bukhari
Sahih al-Bukhari 4842
وَعَنْ عُقْبَةَ بْنِ صُهْبَانَ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ الْمُغَفَّلِ الْمُزَنِيِّ، فِي الْبَوْلِ فِي الْمُغْتَسَلِ.
`Abdullah bin Al-Mughaffal Al-Muzani also said:
"The Prophet (ﷺ) also forbade urinating at the place where one takes a bath."
Reported by Al-Bukhari (No. 4842).