Exodus 32:15 in the King James Version
And Moses turned, and went down from the mount, and the two tables of the testimony were in his hand: the tables were written on both their sides; on the one side and on the other were they written.
Context
14 So the LORD turned away from the evil which he said he would do to his people.
15 Moses turned, and went down from the mountain, with the two tablets of the covenant in his hand; tablets that were written on both their sides. They were written on one side and on the other.
16 The tablets were the work of God, and the writing was the writing of God, engraved on the tablets.