SHAFAQNA – Allah (SWT) described the holy month of Ramadhan as: A month when the Quran has been descended, not a month that fasting has become Wajeb (obligatory by the religious decree). There are hundreds of divine decrees in the Quran of which one of them is fasting. Ayah 185, Surah Al-Baqarah says: The month of Ramadhan is when the Quran was sent down with clear guidance and distinction between truth and falsehood. And fasting is one of the divine decrees in the Quran.
Translated from explanation in Farsi by the Grand Ayatollah Javadi Amoli