John Gill Commentary Numbers 12:5

"And Jehovah came down in a pillar of cloud, and stood at the door of the Tent, and called Aaron and Miriam; and they both came forth." — Numbers 12:5 (ASV)

The Lord came down in the pillar of the cloud
Which was over the most holy place of the tabernacle, and which was a symbol of the presence of the Lord; and who is said to come down, because that was above the tabernacle; whereas he came, as is next expressed,

and stood [in] the door of the tabernacle ;
where he set up his tribunal, and called them to his bar, courts of judicature being usually held in the gate; not suffering them to go into the tabernacle as they were wont to do, being delinquents:

and called Aaron and Miriam ;
to come nearer to him, and hear what he had to say to them; Moses keeping at a greater distance, it not being so proper that he should be within hearing of those commendations which were about to be given of him;

and they both came forth ;
Aaron and Miriam, and stood before the Lord.