This Bible contradiction is from the Skeptic's Annotated Bible.
Deuteronomy 24:1-2 View context
When a man hath taken a wife, and married her, and it come to pass that she find no favour in his eyes, because he hath found some uncleanness in her: then let him write her a bill of divorcement, and give [it] in her hand, and send her out of his house.
And when she is departed out of his house, she may go and be another man's [wife].
Luke 16:18 View context
Whosoever putteth away his wife, and marrieth another, committeth adultery: and whosoever marrieth her that is put away from [her] husband committeth adultery.