פֶּ֣ה אֶל־פֶּ֞ה אֲדַבֶּר־בּ֗וֹ וּמַרְאֶה֙ וְלֹ֣א בְחִידֹ֔ת וּתְמֻנַ֥ת יְהוָ֖ה יַבִּ֑יט וּמַדּ֙וּעַ֙ לֹ֣א יְרֵאתֶ֔ם לְדַבֵּ֖ר בְּעַבְדִּ֥י בְמֹשֶֽׁה׃
Bibig sa bibig Ako nakikipag-usap sa kanya, nang hayagan at hindi sa pamamagitan ng mga talinghaga, at ang anyo ng Walang-Hanggan ay kanyang namamasdan. Bakit nga hindi kayo natakot na magsalita laban sa Aking lingkod, laban kay Moises?”
Rashi
פה אל פה MOUTH TO MOUTH [I HAVE SPOKEN WITH HIM] — I have Myself told him to separate from his wife. And where did I tell him this? On Sinai, when I said to him, (Deuteronomy 5:27 Deuteronomy 5:28) “Go, say to them (to the people), ‘Get you into your tents (rejoin your wives). But as for thee, remain thou here by Me, [and I will speak unto thee]’” (Shabbat 87a; cf. Sifrei Bamidbar 103).
Aderet Eliyahu
Verse: "By way of a hint: I will speak with him (Moshe) face to face, openly and not in riddles." Commentary: "For the Nukva is located in the middle line, and the name 'Hashem' is given to her in the aspects of Aleph(one) in the crown, Aleph in the foundation, Aleph in Tiferet, Aleph in Da'at, and Aleph in the aspect of a distinct face. It is known that the Patriarchs were in the aspect of "shuruk katan", and their root was in the aspect of cholam, shuruk and chirik (vowelization points). The meaning is that 'Keter Ehad' (the supernal crown) cleaved to the Shekhinah, and this is the aspect of the men who belonged to 'Keter Ehad.' Abraham took the lower aspect in the crown, which is called 'Sihara,' as known, and it is called 'Sihara Tzedek.' Isaia 41:2: "Who has roused a victor from the East, summoned him to G-d’s service?" as it is written: Exodus 24:10 "and they saw the G-d of Israel; under whose feet was the likeness of a pavement of sapphire". Therefore, the Sihara is called 'Lavana' (moon) - the attribute of chessed/kindness. Therefore "mountain" is the secret of the apple, as known. Isaac took the aspect of Yesod, and he is called 'Yitzhak Ketz Chai' (Isaac, the end of life), as it is written in Tikunei Zohar Chadash 98: 'Yitzhak Ketz Chai Olamin (Isaac, the end of life of the worlds).' It is tied with the left. There he is called 'field' and is connected to Nun-Heh-Yod (Netzach Hod Yesod) as is known and this is the meaning of "field that is abandoned and plowed" like it says: Genesis 47:23: "here is seed for you to sow the land" and Genesis 47:19: "and that the land may not become a waste.” Jacob took the aspect of Tav Tav (Tiferet) meaning 'Bayit' (house) like: Yeshayahu 47:13 As a man's glory to sit in a house. As our Sages said, ' From (all) my days, I have not called my wife, my wife,' etc. For in the aspect of field is nothing, except when it is given over to be plowed, unlike a house, where a person is always present. And this is the aspect of Yesod and Tiferet, which is called 'Ish' (man), and Tiferet is called 'Adam.' This is the secret of 'and no man passed there, and no man dwelled there.' Here he passed (field), and here he dwelled (house), and they are the general principle of all, like the three aforementioned points. They are the general principle and the general body: head, abdomen, and body. They are the general principle of NR"N (Nefesh-Ruach-Neshamah), and likewise all the principles of the Merkavah (Divine Chariot) and the general principle of the Ten Sefirot, as known. And this is in the external aspect, and it is known that Da'at includes Chessed and Gevurah, graces/sefirot, that draw from the small face. And this is Kel De'ot (G-d of knowledge), the secret of the knowledge of Z"A (Zeir Anpin). And Moshe is the "principle" of da'at, awesome and holy and that is the "bridal aspect" of Moshe Rabbeinu and this is the meaning that Jakob served with his body and Moshe served with his spirituality for da'at is the inner fragrance and therefore he (Moshe) separated from his wife for he served with his mind/spirit, and this is the secret of the union of kisses, which is the voice and speech, and the hidden knowledge in the mouth, as stated in Perek Mishpatim (Chapter on Laws). And this is what it means, 'Face to face, I will speak with him,' and in the fifth aspect, which is the face. This is the second of the lights that diminished, as it said, "aleph" immediately followed "tav" on the fourth day when the lights were diminished.' And she descended into "beriya", and this is ' HeshemElokeinu.' And this is with Z"A (Zeir Anpin), and makes it a complete Name, and it is the aspect of Judah. And David is the fourth leg to the forefathers, as they brought him to their level, which is HG"T (Chessed-Gevurah-Tiferet), and this is the fourth leg. And this is what is meant by 'Judah descended,' as known. And this is 'Avnei Ma'asu Habonim' (the stone the builders rejected), and it is the supernal Malchut (kingdom) of the ten s'firot, as known. And this full name will ascend in the future, and this is what 'shall be the cornerstone' means."
Sforno
This is the meaning of the expression פה אל פה אדבר בו, “I speak to him as if one mouth to another mouth.” When he experiences prophetic insights he does not have to take leave of his senses and be put to sleep so that his senses have first become neutralised.