Musnad Ahmad 30:2233

'Affan narrated to us, he said: Hammad bin Salamah narrated to us, he said: 'Ali bin Zayd, Salih al-Mu'allim, Humayd, and Yunus informed us, from al-Hasan, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The five prayers, and Friday to Friday, are expiations for what is between them, as long as the major sins are avoided."