Musnad Ahmad 937:23

Muhammad ibn Sabiq narrated to us, Ibrahim ibn Tahman narrated to us, from Mansur, from Rib'i ibn Hirash, from al-Ma'rur ibn Suwayd, from Abu Dharr, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Allah says: 'O son of Adam, if you were to commit sins that would fill the earth, and then you did not associate anything with Me, I would grant you forgiveness that would fill the earth.'"