Musnad Ahmad 30:3155

'Abd al-Rahman narrated to us, Zuhayr—meaning Ibn Muhammad—narrated to us, from al-'Ala', from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "The five prayers, and Friday to Friday, are expiations for what is between them, as long as the major sins are not committed."