It was narrated from Abu Hurairah that the Messenger of Allah said: "When the month of Ramadan begins, the gates of Paradise are opened and the gates of Hell are shut, and the devils are fettered"
SahihSahihSahih - Agreed UponBook 22 · Hadith 8
سنن النسائي
It was narrated from Abu Hurairah that the Messenger of Allah said: "When the month of Ramadan begins, the gates of Paradise are opened and the gates of Hell are shut, and the devils are fettered"