This Bible contradiction is from the Skeptic's Annotated Bible.
Satan entered Judas before the last supper.
Luke 22:3 View context
Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve.
Satan entered Judas after the last supper.
John 13:27 View context
And after the sop Satan entered into him. Then said Jesus unto him, That thou doest, do quickly.