Deuteronomy 9:16

And I looked,.... When he was come down from the mount, and was nigh the camp:

and, behold, ye had sinned against the Lord your God; that plainly appeared by what they had done, and at which he was amazed; and therefore a behold is prefixed to it, it being such a gross sin, having so much impiety and ingratitude, and stupidity in it:

and made you a molten calf; that he saw with his eyes, and them dancing about it; see Exodus 32:19

ye had turned aside quickly out of the way which the Lord had commanded you; see Deuteronomy 9:7.