Sunan an-Nasa'i 2103
سنن النسائي#2103SahihIt was narrated form Anas bin Malik that the Messenger of Allah said:" There has come to you Ramadan in which the gates of Paradise are opened, the gates of the fire are closed and the devils are chained up." (Sahih) Abu 'Abdur-Rahman said: this narration is a mistake
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Lighairihi
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 22:14