Jamieson, Fausset and Brown on Exodus 32:19

19. Moses' anger waxed hot, and he cast the tables out of his hands--The arrival of the leader, like the appearance of a specter, arrested the revellers in the midst of their carnival, and his act of righteous indignation when he dashed on the ground the tables of the law, in token that as they had so soon departed from their covenant relation, so God could withdraw the peculiar privileges that He had promised them--that act, together with the rigorous measures that followed, forms one of the most striking scenes recorded in sacred history.