Musnad Ahmad 27:1251

Rawh narrated to us, Hammam narrated to us, from ‘Ata’ ibn al-Sa’ib, from ‘Abdullah ibn ‘Ubayd ibn ‘Umayr, from his father, who said: I said to Ibn ‘Umar: I see you jostling at these two corners. He said: If I do so, it is because I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "Indeed, wiping them removes sins." He said: And I heard him say: "Whoever circumambulates this House seven times, counting them, there shall be written for him for every step a good deed, and a bad deed shall be erased from him, and a degree shall be raised for him, and it shall be equivalent to the freeing of a slave."