It’s Aaron and Miriam’s turn to do a little complaining as they question if Moses is the only one God speaks through. God explains some things about how he deals with Moses. In his anger Miriam is struck with leprosy for seven days. That pales in comparison to what is coming.

Numbers 12 

Miriam and Aaron spoke against Moses because of the Cushite woman whom he had married: for he had married an Cushite woman.