Several Old Testament prophets referred to Jerusalem as being a spiritual harlot and a mother of such harlotry (Isaiah 1:21; Jeremiah 2:20; 3:1–11; Ezekiel 16:1–43; 23, as well as Epistle to the Galatians 4:25). Some of these Old Testament prophecies, as well as the warnings in the New Testament concerning Jerusalem, are in fact very close to the text concerning Babylon in Revelation. This suggests that John of Patmos may well have actually been citing those prophecies in his description of Babylon.