228 - باب استحباب صوم ستة أيام من شوال
The Desirability of Fasting six Days in the Month of Shawwal
1254 - عن أبي أيوب رضي الله عنه أن رسول الله صلى الله عليه و سلم قال : [ من صام رمضان ثم أتبعه ستا من شوال كان كصيام الدهر ] رواه مسلم
1254. Abu Ayyub (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, "He who observes As-Saum (the fasts) in the month of Ramadan, and also observes As-Saum for six days in the month of Shawwal, it is as if he has observed As-Saum for the whole year.''
Commentary: According to the formula that there is at least ten-fold reward for every virtue, the Saum of one month (Ramadan) are equivalent to Saum of ten months. If one also observes six days of Saum of Shawwal, they will be equal to Saum of two months. Thus, one becomes eligible for the reward of one full years' Saum. He who makes it a permanent feature is like one who observes Saum throughout his life. He will be considered by Allah as one who observes Saum permanently. Although voluntary in nature, they are highly important. One can observe these six-day Saum at a stretch or with intervals, but their observance one after the other at the beginning of the month is better. Similarly, if a person has missed some Saum of Ramadan due to illness, travelling etc., he should first make up the shortfall and then observe the voluntary six-day Saum of Shawwal.
229 - باب استحباب صوم الإثنين والخميس
The Desirability of Observing Saum (Fasting) on Monday and Thursday