Forty Hadiths On Ramadan

Hadith No. 03

Ramadan: The Month of Revelation of the Holy Quran

Imam Reza (A.S.) has said: If one asks, "Why is it that the fasts were made obligatory exclusively in the month of Ramadan and not in the other months?

it would be said, "(this is) because the month of Ramadan is the month in which Allah, the Exalted, had revealed the Holy Quran."

Bihar al-Anwar, vol. 18, pg. 190