Musannaf Ibn Abi Shayba 3:5451

Ibn ‘Uyaynah narrated to us, from ‘Amr, from Muhammad ibn Talhah ibn Rukanah, from ‘Abdullah ibn ‘Ayyash ibn Abi Rabi‘ah, who said: Abu Dharr passed by me while I was praying. He said: "The earth is not wiped except once."