عَنْ ثَوْبَانَ مَوْلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((مَنْ صَامَ رَمَضَانَ، فَشَهْرٌ بِعَشَرَةِ أَشْهُرٍ، وَصِيَامُ سِتَّةِ أَيَّامٍ بَعْدَ الْفِطْرِ، فَذَلِكَ تَمَامُ صِيَامِ السَّنَةِ))
Mawla-e-Rasool Sayyiduna Thawban (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him and his family) said: Whoever fasts during the month of Ramadan, then in reward it will be equal to ten months, and then if he keeps six fasts after breaking the fast, that is, after Eid al-Fitr, then in terms of reward it will be as if he has fasted for the whole year.