Midrash su Salmi 106:21

R. Jeremiah maintained that when they brought their earrings to him, Aaron raised his eyes heavenward and declared: Unto Thee I lift mine eyes, O thou that art enthroned in the heavens (Ps. 123:1). You who know all thoughts are aware that I do this unwillingly. He tossed their earrings into the fire, and the magicians approached and performed magical feats. Some say that Micah ground the bricks that Moses had saved into the mixture, and that he took the tablet which Moses had written upon when he raised Joseph’s coffin out of the Nile and cast them into the smelting furnace amidst the earrings. Then the calf came forth leaping. As it leaped about, the people began to cry out: This is thy god, O Israel. The guardian angels then began to proclaim: They forgot God, their savior, who had done great things in Egypt (Ps. 106:21).

THE GOLDEN CALF
RABBI SIMEON BEN JOCHAI said: When the Holy One, blessed be He, was revealed to Moses out of the thorn-bush, in order to send him to Egypt, Moses spake before the Holy One, blessed be He (saying): Sovereign of all the worlds! Swear to me that all things which I desire to do, Thou wilt do, so that I should not speak words before Pharaoh, and Thou wilt not fulfil them, for then will he slay me. And He swore unto him that "whatsoever thou || desirest to do, I will do, except with reference to two things," (namely,) to let him enter the land (of Canaan), and (to postpone) the day of (his) death. Whence do we know that He swore unto him? Because it is said, "By myself have I sworn, saith the Lord, the word is gone forth from my mouth in righteousness" (Isa. 45:23). When Israel received the commandments they forgot their God after forty days, and they said to Aaron: The Egyptians were carrying their god, and they were singing and uttering hymns before it, and they saw it before them. Make unto us a god like the gods of the Egyptians, and let us see it before us, as it is said, "Up, make us a god" (Ex. 32:1).