Exodus 32:2-5

32:2 So Aaron said to them, “Break off the gold earrings that are on the ears of your wives, your sons, and your daughters, and bring them to me.” 32:3 So all the people broke off the gold earrings that were on their ears and brought them to Aaron. 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.”

Exodus 32:21

32:21 Moses said to Aaron, “What did this people do to you, that you have brought on them so great a sin?”

Exodus 32:35

32:35 And the Lord sent a plague on the people because they had made the calf – the one Aaron made.