This Bible contradiction is from the Infidels.org.
Matthew 12:40 View context
For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.
Mark 10:34 View context
And they shall mock him, and shall scourge him, and shall spit upon him, and shall kill him: and the third day he shall rise again.