This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

Those who are not with Jesus are against him.

Matthew 12:30 View context

“Whoever is not with me is against me, and whoever does not gather with me scatters.

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Luke 11:23 View context

“Whoever is not with me is against me, and whoever does not gather with me scatters.

Those who are not against Jesus are for him.

Mark 9:40 View context

for whoever is not against us is for us.

Note: This puts those who are indifferent or undecided in the “for him” category in the first instance and in the “against him” category in the second instance.

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Luke 9:50 View context

“Do not stop him,” Jesus said, “for whoever is not against you is for you.”