Ja`far b. Muhammad b. Masrur narrated to us. He said: Al-Husayn b. Muhammad b. `Amer narrated to us from his uncle `Abdullah b. `Amer from Muhammad b. Abi `Umayr from Hammad b. `Uthman from al-Halabi. He asked Aba `Abdillah al-Sadiq about fasting while in the city (not travelling). So, he said: There are three days in every month: (1) the Thursday before [the first] Friday, (2) the Wednesday before [the second] Friday, and (3) the Thursday before [the third] Friday. So, al-Halabi said to him: Is this a day for every ten days? He said: Yes. And Amir al-Mu’minin said: Fasting the month of Ramadan and three days of every month removes anxiety from the chests. Surely, fasting three in every month is equal to fasting for the whole year. Allah says, “He who comes with a good deed shall be rewarded tenfold.” (6:160)