It is narrated that the Prophet ﷺ said:

"The month of Ramadan has come, a blessed month in which Allah Almighty has obligated you to fast. In it the gates of the heavens are opened, the gates of Hellfire are closed, the devils are chained, and in it is a night that is better than a thousand months. Thus, whoever is deprived of its good is truly deprived."

This Hadith serves as a formal announcement of the "Ramadan atmosphere." It lists the opening of Heaven's gates (mercy), the closing of Hell's gates (protection), the chaining of devils (ease of worship), and the presence of Laylat al-Qadr.