Sahih al-Bukhari 4842
`Abdullah bin Al-Mughaffal 
Al-Muzani also said:
"The Prophet (ﷺ) also forbade urinating at the place where one takes a bath."
وَعَنْ عُقْبَةَ بْنِ صُهْبَانَ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ الْمُغَفَّلِ الْمُزَنِيِّ، فِي الْبَوْلِ فِي الْمُغْتَسَلِ‏.‏