Exodus 32:3 - 32:5
3 Then all the people tore off the gold rings which were in their ears and brought them to Aaron. 4 And he took this from their hand and fashioned it with a graving tool and made it into a molten calf; and they said, “These are your gods, O Israel, who brought you up from the land of Egypt.” 5 And Aaron looked and built an altar before it; and Aaron made a proclamation and said, “Tomorrow shall be a feast to Yahweh.”