Bnei Yisroel is waiting for Moshe and thinks he's late
Moshe comes down and drops the luchot
Moshe went up the mountain to talk to Hashem and learn all the torah to teach to Bnei Yisroel.
Moshe's davening saves Bnei Yisroel
Because Bni Yisrosl sinned I (Hashem) will kill them.
If you kill them, then erase me from your book!!
Bnei Yisroel thought Moshe was late because he wasn't coming down. They counted the 40 days and nights wrong. Bnei Yisroel thought Moshe wasn't going to come down the mountain, so they asked Aharon to make them a golden calf.
Whoever is with Hashem come here
Whoever is with Hashem come here.
Moshe comes down the mountain and sees Bnei Yisroel dancing around a golden calf. Moshe is so surprised that he drops the luchot because he doesn't think Bnei Yisroel deserve them.
Moshe goes back up the mountain
Hashem wanted to kill all of the Jewish people because they sinned by having Aharon make them a god. They also danced around it.
Moshe thought nobody was with Hashem, so he decided to call out to all of Bnei Yisrael, saying, "whoever is with Hashem come here. Only shavet Levi came. That shavet was the only one that didn't sin. They got to be kohanim as a reward.
Moshe goes back up the mountain to get the another pair of luchot.