Jami` at-Tirmidhi 317
جامع الترمذي#317SahihAbu Sa'eed Al-Khudri narrated that :Allah's Messenger said: "All of the earth is a Masjid except for the graveyard and the washroom
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
Zubair Ali ZaiIsnaad Sahih
In-book reference: 2:169