Jami` at-Tirmidhi 90
جامع الترمذي#90SahihIbn Umar narrated:"A man greeted the Prophet (with Salam), and he was urinating, so he did not respond to him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan Sahih
Al-AlbaniHasan Sahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 1:90