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

Verses

Before driving the merchants from the temple.

Mark 11:12-17 View context

And on the morrow, when they were come from Bethany, he was hungry:

And seeing a fig tree afar off having leaves, he came, if haply he might find any thing thereon: and when he came to it, he found nothing but leaves; for the time of figs was not [yet].

And Jesus answered and said unto it, No man eat fruit of thee hereafter for ever. And his disciples heard [it].

And they come to Jerusalem: and Jesus went into the temple, and began to cast out them that sold and bought in the temple, and overthrew the tables of the moneychangers, and the seats of them that sold doves;

And would not suffer that any man should carry [any] vessel through the temple.

And he taught, saying unto them, Is it not written, My house shall be called of all nations the house of prayer? but ye have made it a den of thieves.

After driving the merchants from the temple..

Matthew 21:12 View context

And Jesus went into the temple of God, and cast out all them that sold and bought in the temple, and overthrew the tables of the moneychangers, and the seats of them that sold doves,