Exodus 32:4-8, 35

And he received the gold from their hand and fashioned it with a graving tool and made a golden calf. And they said, “These are your gods, O Israel, who brought you up out of the land of Egypt!” When Aaron saw this, he built an altar before it. And Aaron made a proclamation and said, “Tomorrow shall be a feast to the LORD.” And they rose up early the next day and offered burnt offerings and brought peace offerings. And the people sat down to eat and drink and rose up to play. And the LORD said to Moses, “Go down, for your people, whom you brought up out of the land of Egypt, have corrupted themselves. They have turned aside quickly out of the way that I commanded them. They have made for themselves a golden calf and have worshiped it and sacrificed to it and said, ‘These are your gods, O Israel, who brought you up out of the land of Egypt!’”

Then the LORD sent a plague on the people, because they made the calf, the one that Aaron made.