Exodus 32:1-5

And when the people saw that Moses delayed to come down from the mount, the people gathered themselves together unto Aaron, and said unto him, Up, make us gods, which shall go before us; for as for this Moses, the man that brought us up out of the land of Egypt, we know not what is become of him. And Aaron said unto them, Break off the golden rings, which are in the ears of your wives, of your sons, and of your daughters, and bring them unto me. And all the people brake off the golden rings which were in their ears, and brought them unto Aaron. And he received it at their hand, and fashioned it with a graving tool, and made it a molten calf: and they said, These are thy gods, O Israel, which brought thee up out of the land of Egypt. And when Aaron saw this, he built an altar before it; and Aaron made proclamation, and said, To-morrow shall be a feast to Jehovah.