Deuteronomy 9:20-21

20And the Lord was so angry with Aaron that he was ready to destroy him. And I prayed for Aaron also at the same time.

21Then I took the sinful thing, the calf that you had made, and burned it with fire and crushed it, grinding it very small, until it was as fine as dust. And I threw the dust of it into the brook that ran down from the mountain.