This Bible contradiction is from the Skeptic's Annotated Bible.
Deuteronomy 34:7 View context
And Moses [was] an hundred and twenty years old when he died: his eye was not dim, nor his natural force abated.
Deuteronomy 31:2 View context
And he said unto them, I [am] an hundred and twenty years old this day; I can no more go out and come in: also the LORD hath said unto me, Thou shalt not go over this Jordan.