وَعَنْ أَبِي أَيُّوبَ اَلْأَنْصَارِيِّ ‏- رضى الله عنه ‏- أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ: { مَنْ صَامَ رَمَضَانَ, ثُمَّ أَتْبَعَهُ سِتًّا مِنْ شَوَّالٍ كَانَ كَصِيَامِ اَلدَّهْرِ } رَوَاهُ مُسْلِمٌ 1‏ .‏‏1 ‏- صحيح.‏ رواه مسلم ( 1164 )‏.‏

"Whoever fasts during the month of Ramadan and then follows it with six days of Shawwal will be (rewarded) as if he had fasted the entire year." Related by Muslim.