Deuteronomy 9:17

I... brake them before your eyes. — This shows that the act was deliberate on Moses’ part. He did not simply drop the tables in his passion before they reached the camp; he deliberately broke the material covenant in the face of the people, who had broken the covenant itself. When we remember the effect of hastily touching not the tables of the Law themselves, but the mere chest that contained them, in after-times, we may well believe that the breaking of these two tables was an act necessary for the safety of Israel. In Exodus 33:7, we read that Moses placed the temporary tabernacle outside the camp at the same time. The two actions seem to have had the same significance, and to have been done for the same reason.