Sunan Abi Dawud 492

Musa ibn Ismaʿil narrated to us: Hammad narrated to us. And Musaddad narrated to us: ʿAbd al-Wahid narrated to us, from ʿAmr ibn Yahya, from his father, from Abu Saʿid, who said that the Messenger of Allah (peace and blessings be upon him) said—and in his report Musa said, according to what ʿAmr thought, that the Prophet (peace and blessings be upon him) said: ‘The whole earth is a place of prayer except the public bath and the graveyard.’