In the Chapter Al-Baqarah of the Quran, there are five verses that deal with fasting in the month of Ramadan. (2:183-187). In the book of Hadith Mishkat al-Masabih, seventy-three sayings of the Prophet have been quoted with regard to fasting. Detailed provisions regarding Ramadan can be found in the books of fiqh.
In a Hadith, the Prophet of Islam has said: “Every deed in Islam is rewarded from ten to seven hundred times. But God says, ‘Fasting is for me, and I will give unlimited reward to one who fasts.’” (Sahih Muslim, Hadith No. 1151)