15 And Moses turned, and went down from the mount, with the two tables of the testimony in his hand; tables that were written on both their sides; on the one side and on the other were they written. 16 And the tables were the work of God, and the writing was the writing of God, graven upon the tables. 17 And when Joshua heard the noise of the people as they shouted, he said unto Moses, There is a noise of war in the camp. 18 And he said, It is not the voice of them that shout for mastery, neither is it the voice of them that cry for being overcome; but the noise of them that sing do I hear. 19 And it came to pass, as soon as he came nigh unto the camp, that he saw the calf and the dancing: and Moses' anger waxed hot, and he cast the tables out of his hands, and brake them beneath the mount. 20 And he took the calf which they had made, and burnt it with fire, and ground it to powder, and strewed it upon the water, and made the children of Israel drink of it.

Matthew Henry's Commentary on Exodus 32:15-20

Commentary on Exodus 32:15-20

(Read Exodus 32:15-20)

What a change it is, to come down from the mount of communion with God, to converse with a wicked world. In God we see nothing but what is pure and pleasing; in the world nothing but what is sinful and provoking. That it might appear an idol is nothing in the world, Moses ground the calf to dust. Mixing this powder with their drink, signified that the backslider in heart should be filled with his own ways.