Jami` at-Tirmidhi 70
جامع الترمذي#70SahihIbn Abbas narrated:"The Prophet passed by two graves. He said: 'These two are being punished. And they are not being punished for something major. As for this one, he would not protect himself from his urine. As for this one, he used to spread Namimah (slander)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 1:70