Miriam and Aaron talked against Moses behind his back because of his Cushite wife (he had married a Cushite woman).
They said, "Is it only through Moses that God speaks? Doesn't he also speak through us?" God overheard their talk.
Now the man Moses was a quietly humble man, more so than anyone living on Earth.
God broke in suddenly on Moses and Aaron and Miriam saying, "Come out, you three, to the Tent of Meeting." The three went out.
God descended in a Pillar of Cloud and stood at the entrance to the Tent. He called Aaron and Miriam to him. When they stepped out,
he said, Listen carefully to what I'm telling you. If there is a prophet of God among you, I make myself known to him in visions, I speak to him in dreams.