Mukhtasar Muslim

It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: The five prayers and from one Friday to the next Friday are expiation for the sins committed in between them, as long as major sins are not committed. And in another narration: Ramadan to the next Ramadan is expiation for the sins committed in between them, as long as major sins are not committed.