Exodus 32
4 Ref And he took the gold from them and, hammering it with an instrument, he made it into the metal image of a young ox: and they said, This is your god, O Israel, who took you out of the land of Egypt.
5 Ref And when Aaron saw this, he made an altar before it, and made a public statement, saying, Tomorrow there will be a feast to the Lord.
6 Ref So early on the day after they got up and made burned offerings and peace-offerings; and took their seats at the feast, and then gave themselves to pleasure.