When the first night of the month of Ramadan comes, devils and rebellious jinn are fastened by chains. The gates of Hell are closed; none of its doors is kept open. As for the gates of Paradise, they are opened widely and none of them is kept closed.
A call which every Muslim feels in their hearts spreads:
O the ones who are eager to do favors, do good deeds!
O the ones who desire evil, control yourselves!
There will be many people whom God saves from Hell tonight. This situation is repeated at every night of the month of Ramadan.
(Bukhari, Sawm: 5; Bad’u’l-Halk: 11; Muslim, Siyam: 2; Nasai, Siyam: 5)