It was narrated from 'Abdullah bin Mughaffal that the Prophet (ﷺ) said:
"None of you should urinate in the place where he bathes, for most Waswas (devilish whispers) [1] come from that."[1] I.e., with regard to whether the urine has soiled his body or not.
Arabic/English book reference: Vol. 1, Book 1, Hadith 36