Numbers 12:5

בעמוד ענן [AND THE LORD CAME DOWN] IN THE COLUMN OF THE CLOUD — He came alone to punish them, not as is the manner of human beings: when a human king goes to war, he goes with numerous troops, but when he goes forth peaceably, he goes forth with only a few. But the manner of the Holy One, blessed be He, is that He goes to war alone — as it is said, (Exodus 15:3) “The Lord alone is the man of war, but He goes forth for peace accompanied by His hosts, as it is said, (Psalms 68:18) “The chariots of God are twenty thousands, even thousands of angels of peace (שנאן)” (Sifrei Bamidbar 102). ויקרא אהרן ומרים AND HE CALLED: “AARON AND MIRIAM!” — that they should proceed further, and go forth from the court towards God (more lit., the Divine Speech) (Sifrei Bamidbar 102). ויצאו שניהם AND THEY BOTH WENT FORTH — And why did He bid them go further and so separate them from Moses? Because there is a rule that one should utter only a part of a man’s good qualities in his presence, but that the whole of them should be told only in his absence. Similarly we find in the case of Noah, that in his absence (i.e. when Scripture speaks about him) it says of him: “a righteous and whole-hearted man” (Genesis 6:9), whilst in his presence (i.e. where God is speaking to Noah) it states, (Genesis 7:1) “for thee I have seen righteous before me”, (and it does not add: whole-hearted) (Sifrei Bamidbar 102). — Another explanation is: God bid only Aaron and Miriam to draw near in order that he (Moses) should not hear the reprimand administered to Aaron.

וַיֵּ֤רֶד יְהֹוָה֙ בְּעַמּ֣וּד עָנָ֔ן וַֽיַּעֲמֹ֖ד פֶּ֣תַח הָאֹ֑הֶל וַיִּקְרָא֙ אַהֲרֹ֣ן וּמִרְיָ֔ם וַיֵּצְא֖וּ שְׁנֵיהֶֽם׃

And the Lord came down in the pillar of cloud, and stood in the door of the tent, and called Aharon and Miryam: and they both came out.