Prophet Muhammad (sa) said: “O people! Month of God (Ramadan) has come toward you bringing divine blessing, mercy and forgiveness. This is the month in which you have been invited to the feast of God. In this month, you are made of those people whom Allah respects and honors.Your breaths in it (the month of Ramaḍan) are glorification (of God) and your sleep in it is worship. In the sight of God, this month is the best month, its days are the best days, its nights are the best nights and its hours are the best hours.”

Part of a sermon delivered by Prophet Muhammad (sa), describing the virtues of the month of Ramadan

Ref: Al-Amali by Al-Saduq – pg. 93