Sunan Ibn Majah 745
سنن ابن ماجه#745SahihIt was narrated that Abu Sa'eed Khudri said:"The Messenger of Allah said: 'All the earth is a mosque, except for graveyards and Hammam
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 4:11