The Prophet (may Allah's peace and blessings be upon him) used to fast some days every month on a voluntary basis, and he urged his Companions to do the same. He also urged the fasting of some days within the months of the year, given their abundant reward. In this Hadīth, he directed the Muslims to fast six days in Shawwāl, after Ramadan, and pointed out that if anyone fasts the entire Ramadan and then fasts six days in Shawwāl, successive or sporadic - for fasting them successively or sporadically falls under the adherence to the Sunnah - he will obtain a reward equivalent to fasting the entire year. This stems from the great bounty of Allah towards His Muslim servants, as He multiplies the reward for them. This is explained by the verse that reads: {Whoever comes with a good deed will be rewarded tenfold.} [Surat al-An‘ām: 160] The month of Ramadan is equivalent to ten months, and fasting six days after Eid al-Fitr completes the year. The Hadīth points out the merit of fasting six days in the month of Shawwāl..