Exodus 32:4-8, 35

Then Aaron took the gold, melted it down, and molded it into the shape of a calf. When the people saw it, they exclaimed, “O Israel, these are the gods who brought you out of the land of Egypt!” Aaron saw how excited the people were, so he built an altar in front of the calf. Then he announced, “Tomorrow will be a festival to the LORD!” The people got up early the next morning to sacrifice burnt offerings and peace offerings. After this, they celebrated with feasting and drinking, and they indulged in pagan revelry. The LORD told Moses, “Quick! Go down the mountain! Your people whom you brought from the land of Egypt have corrupted themselves. How quickly they have turned away from the way I commanded them to live! They have melted down gold and made a calf, and they have bowed down and sacrificed to it. They are saying, ‘These are your gods, O Israel, who brought you out of the land of Egypt.’”

Then the LORD sent a great plague upon the people because they had worshiped the calf Aaron had made.