This Bible contradiction is from the Skeptic's Annotated Bible.
Deuteronomy 10:1-3 View context
At that time the LORD said unto me, Hew thee two tables of stone like unto the first, and come up unto me into the mount, and make thee an ark of wood.
And I will write on the tables the words that were in the first tables which thou brakest, and thou shalt put them in the ark.
And I made an ark [of] shittim wood, and hewed two tables of stone like unto the first, and went up into the mount, having the two tables in mine hand.
Exodus 37:1 View context
And Bezaleel made the ark [of] shittim wood: two cubits and a half [was] the length of it, and a cubit and a half the breadth of it, and a cubit and a half the height of it: