民数記 12:6

שמעו נא דברי HEAR, I PRAY YOU, MY WORDS — The word נא is always an expression of entreaty (Sifrei Bamidbar 103). אם יהיה נביאכם means, IF THERE WOULD BE PROPHETS TO YOU (i.e. if you had a prophet — if you could show one to me). ה׳ במראה אליו אתודע This means: the Shechinah (the Divine Glory) of my Name does not reveal Itself unto him in a “transparent glass” (i.e. a direct revelation), but in dreams and visions (cf. Sifrei Bamidbar 103).

וַיֹּ֖אמֶר שִׁמְעוּ־נָ֣א דְבָרָ֑י אִם־יִֽהְיֶה֙ נְבִ֣יאֲכֶ֔ם יְהֹוָ֗ה בַּמַּרְאָה֙ אֵלָ֣יו אֶתְוַדָּ֔ע בַּחֲל֖וֹם אֲדַבֶּר־בּֽוֹ׃

And he said, Hear now my words: If there be a prophet among you, I the Lord make myself known to him in a vision, and speak to him in a dream.