Why did Miriam get leprosy, and what did God do about it?
Miriam was afflicted with leprosy because of some of her complaints, and God dealt with the situation. Yet He also healed her, showing both judgment and mercy. This episode occurred before Israel reached Numbers chapter 14, during the time the cloud led them toward the promised land.
Les teaches that the episode of Miriam's leprosy happened because of some of her complaints, and God dealt with it, but fortunately He also healed her. In the flow of the narrative, this occurred before the events of Numbers chapter 14, after the cloud lifted and directed Israel up to the border of the promised land. Les notes he is skipping some things for sake of time, but he reminds us that a lot took place between the tabernacle being raised and Israel reaching the border. The account of Miriam is one of those intervening events.