Musannaf Ibn Abi Shayba 3:5371

Abu Bakr narrated to us, he said: Muhammad ibn Fudayl narrated to us, from Abu Malik al-Ashja‘i, from Rib‘i ibn Hirash, from Hudhayfah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The entire earth has been made a place of prostration (masjid) for us."