Jamieson, Fausset and Brown on Exodus 32:5-6

5-6. Aaron made proclamation, and said, To-morrow is a feast to the Lord--a remarkable circumstance, strongly confirmatory of the view that they had not renounced the worship of Jehovah, but in accordance with Egyptian notions, had formed an image with which they had been familiar, to be the visible symbol of the divine presence. But there seems to have been much of the revelry that marked the feasts of the heathen.