عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((الصَّلَوَاتُ الْخَمْسُ وَالْجُمُعَةُ إِلَى الْجُمُعَةِ وَرَمْضَانُ إِلَى رَمْضَانَ مُكَفِّرَاتٌ لِمَا بَيْنَهُنَّ، مَا اجْتُنِبَتِ الْكَبَائِرُ))
It is narrated from Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The five prayers, from one Friday to the next Friday, and from one Ramadan to the next Ramadan, are expiation for the sins committed in between, as long as major sins are avoided.