Matthew 5:29 gives the same radical teaching about cutting off a body part to avoid sin, with the same logic of entering life maimed.

Matthew 5:30 repeats the same instruction for the right hand, emphasizing the drastic measure to avoid sin.

Matthew 25:41 pronounces 'eternal fire' — the identical punishment warned against in Matthew 18:8.

Matthew 25:46 describes 'eternal punishment' — directly connected to the 'eternal fire' in Matthew 18:8.

In Mark 9:43-48, the same teaching appears nearly verbatim — both urge cutting off body parts to avoid hell.

Mark 9:48 depicts undying worm and unquenchable fire — Jesus' own parallel teaching on Gehenna's punishment.

Luke 16:24 depicts the rich man tormented in flame, illustrating the 'eternal fire' Jesus warns about here.

2 Thessalonians 1:8 describes Jesus returning in flaming fire to judge the disobedient, echoing the judgment fire of this verse.

Revelation 14:10 describes torment with fire and brimstone, reinforcing the vivid imagery of the eternal fire mentioned here.

Revelation 20:15 declares the lake of fire is the fate of those not in the Book of Life, directly paralleling the 'eternal fire' warning.

Revelation 21:8 lists those destined for the lake of fire, expanding on the types of sinners who face the eternal fire Jesus warns against.

Isaiah 30:33 describes Tophet (Gehenna) prepared with fire and brimstone — the OT background for the 'eternal fire' Jesus references here.

Deuteronomy 13:6-8 commands not sparing even close relatives who entice to idolatry—a similar radical rejection of what causes sin.

Isaiah 33:14 asks who can dwell with everlasting burnings — echoes the judgment fire in Matthew 18:8.

2 Thessalonians 1:9 speaks of everlasting destruction from God's presence, a parallel to the eternal punishment implied by 'eternal fire'.

In Luke 14:26, Jesus demands hating family for His sake — a radical priority parallel to cutting off a hand for sin.