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

Verses

The tomb was open.

Luke 24:2 View context

And they found the stone rolled away from the sepulchre.

Mark 16:3-4 View context

And they said among themselves, Who shall roll us away the stone from the door of the sepulchre?

And when they looked, they saw that the stone was rolled away: for it was very great.

John 20:1 View context

The first [day] of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.

The tomb was closed.

Matthew 28:2 View context

And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it.