It is narrated from Sayyiduna Thawban (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said:“(The fasting of a year is like this:) the fasting of one month is equal to ten months, and after that, the fasting of six days is equal to two months, thus making twelve months and completing a whole year.”That is, one month of Ramadan and after it, six fasts of Shawwal.