Hiban bin Musa bin Sawar حبان بن موسى بن سوار · The Book of Fasting

"The Messenger of Allah said: 'When Ramadan comes, the gates of mercy are opened, the gates of Hell are closed, and the devils are chained up."'

"The Messenger of Allah said to a woman from among the Ansar: 'When it is Ramadan, perform 'Umrah then, for 'Umrah during it is equivalent to Hajj."