Exodus 32:15-16, 19

Then Moses turned and went down from the mountain with the two tablets of the Testimony in his hand; tablets that were written on both sides—they were written on one side and on the other. The tablets were the work of God; the writing was the writing of God engraved on the tablets.

And as soon as he approached the camp and he saw the calf and the dancing, Moses’ anger burned; and he threw the tablets from his hands and smashed them at the foot of the mountain.