God's revelation to Moshe after the sin of the Golden Calf parallels God's revelation to Avraham in the beginning of Parashat Vayera. The comparison positions Moshe in a similar status to Avraham: both are forefathers of the nation, and the two revelations relate to the prophet's prayer for a sinning public who is about to be destroyed. Perhaps their ability to pray is the reason God chooses to make them fathers and leaders of the nation.

Moshe - the revelation in the Tent of Meeting
Moshe's Prayer After the Sin of the Golden Calf
God's revelation to Avraham
Avraham prays for Sodom