Sahih Muslim | Book 6 | Chapter 1

Narrated by Abu Huraira
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: When there comes the month of Ramadan, the gates of mercy are opened, and the gates of Hell are locked and the devils are chained,

Narrated by Abu Huraira
This hadith is reported by Abu Huraira (with a slight alteration of words) that the Messenger of Allah (may peace be upon him) said: "When (the month of) Ramadan begins.