Exodus 32:15-16, 19

Then Moses turned and went down the mountain. He held in his hands the two stone tablets inscribed with the terms of the covenant. They were inscribed on both sides, front and back. These tablets were God’s work; the words on them were written by God himself.

When they came near the camp, Moses saw the calf and the dancing, and he burned with anger. He threw the stone tablets to the ground, smashing them at the foot of the mountain.