2 Thessalonians 2:9-10

The lawless one will be Satan’s instrument. Scripture also calls him the beast coming out of the sea (Revelation 13:1-10), the scarlet beast (Revelation 17:3), and simply the beast (Revelation 17:8; Revelation 17:16; Revelation 19:19-20; Revelation 20:10). Satan will empower him to deceive many people into thinking he is God by doing awe-inspiring, powerful miracles (cf. Revelation 13:2-4; Revelation 17:8).

"The use of parousia here probably suggests a parody of Christ’s Parousia (2 Thessalonians 2:8)." [Note: Bruce, p. 173.]