Musannaf Ibn Abi Shaybah

Hazrat Arfajah narrates that I was with Hazrat Utbah bin Farqad, and he was describing the virtues of Ramadan. In the meantime, a companion arrived, so he became silent. It seemed as if he became silent out of awe for him. When he sat down, Hazrat Utbah said to him, "O Abu so-and-so! Please narrate to us the hadith you heard from the Messenger of Allah, peace and blessings be upon him." He said that the Messenger of Allah, peace and blessings be upon him, said: "In Ramadan, the doors of Paradise are opened, the doors of Hell are closed, the devils are chained, and every night of Ramadan a caller announces: O seeker of good, advance! O seeker of evil, desist!"