You know what, I don't think it said anything about it.
I think there was something in Exodus that said that God banned the Israelites from entering Canaan during Moses's lifetime, as punishment for Moses letting his people go astray. That could have been another incident, though.
But put yourself in Moses's shoes for a moment. You've just spent about three months or so on top of a mountain fasting while carving God's instructions into hard rock. You walk back down the mountain, expecting things to be as you left it, and you walk in on your people worshipping a golden cow statue, doing the exact thing that God JUST told you not to do. If I were him I'd be having rage issues too.
In the end I think God forgave him, probably because He was more concerned with the Israelite's idol worshipping problem than with Moses's anger management. In the end, after Moses chewed everyone out, he went back up the mountain and did the job again. It's a testament to the forgiving nature of God, I guess.
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"Yeah, so this one time, I tried playing poker with tarot cards... got a full house, and about four people died." ~ Unknown comedian
Happy New Year from WP's resident fortune-teller! May the cards be ever in your favor.