"O you who believe! Fasting is prescribed for you as it was prescribed for those before you in order that you might learn piety . . . . The month of Ramadan is that wherein was revealed the Qur'an, as a guidance to mankind, and clear proofs of the guidance, and the Criterion. So, whoever among you witnesses the month should fast." [Al-Qur'an 2:183, 185]
"Every deed of the Son of Adam is for himself, except fasting - it is for Me, and I shall reward it." [Muslim, Abu Dawud, Nasa'i, Tirmidhi, Ibn Majah]
"There is not any believer who remains hungry, and abstains from the forbidden things, and does not wrongfully consume the wealth of Muslims, except that Allah will feed him from the fruits of Heaven." [Musnad Abu Hanifah]
"Whoever fasts Ramadan with faith and expectation [of reward], his previous sins are forgiven him." [Bukhari, Muslim, Abu Dawud, Nasa'i]
"Every deed of the Son of Adam is for himself, except fasting - it is for Me, and I shall reward it." [Muslim, Abu Dawud, Nasa'i, Tirmidhi, Ibn Majah]
"There is not any believer who remains hungry, and abstains from the forbidden things, and does not wrongfully consume the wealth of Muslims, except that Allah will feed him from the fruits of Heaven." [Musnad Abu Hanifah]
"Whoever fasts Ramadan with faith and expectation [of reward], his previous sins are forgiven him." [Bukhari, Muslim, Abu Dawud, Nasa'i]