Yahya related to me from Malik from his paternal uncle Abu Suhaylibn Malik from his father that Abu Hurayra said, "When Ramadan comesthe gates of the Garden are opened and the gates of the Fire arelocked, and the shayatin are chained."
USC-MSA web (English) reference: Book 18, Hadith 59
Arabic reference: Book 18, Hadith 692