7. A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad ibn abu Nasr who has said the following: “I asked abu al-Hassan , about fasting during a month. He replied, ’It is three days every month, one day in every ten days. Allah, the most Blessed, the most High, says, “One who does a good deed receives tenfold reward.” (6:151) Three days of fasting every month is like fasting all the time.’”