Sunan Ibn Majah, Chapter: The Chapters of Establishing the Prayer and the Sunnah Regarding Them

"I met Thawban and said to him: 'Tell me a Hadith that Allah may benefit me thereby.' But he remained silent. Then I said the same and he remained silent. That happened three times. Then he said to me: 'You should prostrate to Allah; for I heard the Messenger of Allah (saw) say: "No one prostrates to Allah but Allah will raise him one degree in status thereby and will erase one of his sins." Ma'dan said: "Then I met Abu Darda and asked him the same question, and he gave a similar answer."