Exodus 32:4-8, 35

And he took the gold from their hands, and fashioned it with an engraving tool and made it into a molten calf; and they said, “This is your god, O Israel, who brought you up from the land of Egypt.” Now when Aaron saw the molten calf, he built an altar before it; and Aaron made a proclamation, and said, “Tomorrow shall be a feast to the LORD!” So they got up early the next day and offered burnt offerings, and brought peace offerings; then the people sat down to eat and drink, and got up to play [shamefully—without moral restraint]. Then the LORD said to Moses, “Go down at once, for your people, whom you brought up from the land of Egypt, have corrupted themselves. They have quickly turned aside from the way which I commanded them. They have made themselves a molten calf, and have worshiped it and sacrificed to it, and said, ‘This is your god, O Israel, who brought you up from the land of Egypt!’ ”

So the LORD struck the people with a plague, because of what they had done with the calf which Aaron had made [for them].