It was narrated on the authority of Abu Ayyoob Al-Ansaari (ral) that the Prophet (sal) said:"Whoever fasts Ramadhaan and then fasts six days of Shawwaal, it is as if he fasts the whole year." [Muslim]
It was narrated on the authority of Thawbaan (ral) that the Prophet (sal) said: "Fasting Ramadhaan equals fasting ten months, and fasting six days [of Shawwaal] equals fasting two months. So both equal fasting the whole year." In another narration, he said: "Whoever fasts six days after breaking the fast [of Ramadhaan], it will be as if he fasted the whole year. Allaah The Almighty Says (what means): {Whoever comes [on the Day of Judgment] with a good deed will have ten times the like thereof [to his credit].} [Quran 6:160]" [Ahmad, Ad-Daarimi, Ibn Maajah, and An-Nasaa’i] [Ibn Khuzaymah and Ibn Hibaan: Saheeh]
