Abu Hurayrah (may Allaah be pleased with him) who said:
The Messenger of Allaah (peace and blessings of Allaah be upon him) said:
“There has come to you Ramadaan, a blessed month which Allaah has enjoined you to fast, during which the gates of heaven are opened and the gates of Hell are closed, and the rebellious devils are chained up. In it there is a night which is better than a thousand months, and whoever is deprived of its goodness is indeed deprived.”
Narrated by al-Nasaa’i, 2106; Ahmad, 8769. classed as saheeh by al-Albaani in Saheeh al-Targheeb, 999.