The calf they made while waiting
“Yahweh passed by before him, and proclaimed, “Yahweh! Yahweh, a merciful and gracious God, slow to anger, and abundant in loving kindness and truth,”Exodus 34:6 · WEB
Moses is up the mountain for forty days and the people below get tired of waiting. They bring their gold to Aaron, who does not refuse, and he makes a calf — and they say, these are your gods, who brought you up out of Egypt. Six weeks after the sea. Aaron's excuse is one of the weakest sentences in the Bible: I threw the gold in the fire and out came this calf. Moses comes down, breaks the tablets, and then does something remarkable: he offers to be blotted out himself if God will forgive them. God renews the covenant — and when he passes by Moses he describes himself, and the description is not thunder but this: merciful and gracious, slow to anger, abounding in steadfast love and faithfulness. Israel learns who God is at their worst moment, not their best.