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

Verses

Do not curse anyone.

Romans 12:14 View context

Bless them which persecute you: bless, and curse not.

It's OK to curse some people.

1 Corinthians 16:22 View context

If any man love not the Lord Jesus Christ, let him be Anathema Maranatha.

Galatians 1:8-9 View context

But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.

As we said before, so say I now again, If any [man] preach any other gospel unto you than that ye have received, let him be accursed.