Musnad Ahmad 30:2075

Harun narrated to us, Abdullah ibn Wahb narrated to us, he said: Abu Sakhr Humayd ibn Ziyad narrated to me, that Umar ibn Ishaq, the freed slave of Zaidah, narrated to him, from his father, from Abu Hurairah, that the Messenger of Allah, peace and blessings of Allah be upon him, used to say: "The five prayers, and Friday to Friday, and Ramadan to Ramadan, are expiations for what is between them, as long as the major sins are avoided." *** Harun ibn Ma'ruf narrated to us, Abdullah said: And I heard it myself from Harun, he said: Abdullah ibn Wahb narrated to us, he said: Abu Sakhr narrated to me, from Abu Hazim, from Abu Salih, from Abu Hurairah, that the Prophet, peace and blessings of Allah be upon him, said: "The believer is one who is friendly and is befriended, and there is no good in one who is neither friendly nor befriended."