Revelation 20:8
And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom is as the sand of the sea.
Cross-reference
Revelation 20:10 describes Satan's final defeat in the lake of fire after his deception and battle gathering in 20:8.
In Revelation 20:3, Satan is bound to prevent deceiving nations; here he is released and again deceives, reversing that state.
Revelation 20:5 describes the first resurrection that precedes the thousand years, setting the chronological context for Satan's release in this verse.
Revelation 16:14 describes demonic spirits gathering kings for battle, same theme as the gathering of nations here.
Revelation 12:9 identifies Satan as 'the deceiver of the whole world' — the same deceiver who goes out to deceive the nations in this verse.
Ezekiel 38:1 introduces Gog and Magog, the same names used here for the nations deceived by Satan.
Isaiah 8:9 summons nations to gather but promises their shattering — the same ironic defeat that Rev 20:9 depicts.
Isaiah 29:7 says nations fighting against Ariel will vanish like a dream — exactly how the gathered armies in Rev 20:9 are consumed.
Ezekiel 38:2 introduces Gog and Magog — the very names Rev 20:8 uses for the nations Satan gathers.
Ezekiel 38:15 describes Gog's invasion from the north — the very prophecy Rev 20:8 alludes to with 'Gog and Magog'.
In Genesis 10:2, Magog appears as a son of Japheth, providing the name that Revelation uses symbolically for the final enemy horde.
1 John 5:19 states the whole world lies in the power of the evil one — this explains why Satan can deceive all the nations as described here.
Zechariah 12:3 describes nations gathering against Jerusalem, similar to the gathering in Rev 20:8.
Joel 3:2 similarly depicts God gathering all nations for judgment in the Valley of Jehoshaphat.
In 2 Chronicles 18:21, a lying spirit deceives prophets, paralleling Satan's deception of the nations here.
Micah 4:3 envisions nations beating swords into plowshares — the opposite of the war gathering in Rev 20:8.
In Psalm 48:4, kings assemble against Zion — a pattern of enemy gathering that Rev 20:8 repeats on a global scale.