Musannaf Ibn Abi Shayba 3:1638

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Dawud ibn Qays, from Zayd ibn Aslam, who said: The mosque used to be sprinkled with water and swept during the time of the Messenger of Allah, may Allah bless him and grant him peace, and Abu Bakr.