This Bible contradiction is from the Skeptic's Annotated Bible.
Exodus 33:11 View context
And the LORD spake unto Moses face to face, as a man speaketh unto his friend. And he turned again into the camp: but his servant Joshua, the son of Nun, a young man, departed not out of the tabernacle.
Deuteronomy 34:10 View context
And there arose not a prophet since in Israel like unto Moses, whom the LORD knew face to face,
No, he only saw his back parts.
Exodus 33:20-23 View context
And he said, Thou canst not see my face: for there shall no man see me, and live.
And the LORD said, Behold, [there is] a place by me, and thou shalt stand upon a rock:
And it shall come to pass, while my glory passeth by, that I will put thee in a clift of the rock, and will cover thee with my hand while I pass by:
And I will take away mine hand, and thou shalt see my back parts: but my face shall not be seen.