Exodus 32:15

And Moses turned and went down from the mountain, and the two tablets of the Testimony were in his hand. The tablets were written on both sides; on the one side and on the other they were written.

Surrounding context

32:14 So the LORD relented from the harm which He said He would do to His people.

32:15 And Moses turned and went down from the mountain, and the two tablets of the Testimony were in his hand. The tablets were written on both sides; on the one side and on the other they were written.

32:16 Now the tablets were the work of God, and the writing was the writing of God engraved on the tablets.

Translation and sources