Exodus 32:4-6

32:4 He accepted the gold from them, fashioned it with an engraving tool, and made a molten calf. Then they said, “These are your gods, O Israel, who brought you up out of Egypt.”

32:5 When Aaron saw this, he built an altar before it, and Aaron made a proclamation and said, “Tomorrow will be a feast to the Lord.” 32:6 So they got up early on the next day and offered up burnt offerings and brought peace offerings, and the people sat down to eat and drink, and they rose up to play.