MUHAMMAD’S TEACHINGS TO MANKIND
“ 'Ubaydullāh Ibn-Muslim al-Qurashī said, "I, or someone else, asked the Messenger of God, peace and blessings of God be upon him, about [the practice of] perpetual fasting. He replied, 'Indeed, you have a duty towards your family (1). Fast [the month of] Rama ḍān, that which is next to it (2), and every Wednesday and Thursday. You would then [be considered to] have fasted continuously, though you have broken fast.'" Footnotes: (1) Perpetual fasting weakens a person's physical and mental capabilities so that it is difficult to fulfill the rights of one's family. (2) This could refer to the six days of the month of Shawwāl, which follows Ramadān; or it could refer to the month of Sha'bān, which precedes Rama ḍān. ”
Sunan at-Tirmithiy كتاب الصلاة باب ما جاء فى فضل التكبيرة الأولى