Shemos (Exodus) 33:11-23 is a fascinating text. In it, Moses and God speak "face to face, as one man speaks to another," yet God proclaims that "man may not see Me and live." Moses demands that he be shown God's full glory and is granted the request: God "will make all My goodness pass before you, and I will proclaim before you the name LORD, and the grace that I grant and the compassion that I show."
The text strongly indicates that Moses was granted the fullest possible view of God's nature at the absolute limit of humanity's capacity to understand. It was incomplete, because finite mortals cannot understand the infinite divine. Moses did not see the "face" of God - and anyone who did receive more revelation on God's nature would die. But it was maximally comprehensive to the human limit, as Moses saw "all" of God's goodness, Name, grace, and compassion.
This should be deeply disturbing to Trinitarians! Moses nowhere informed the Jewish people that God was triune. If Moses had seen "all [God's] goodness" then he should have been aware of God's triune nature, if it were true. But Moses appears to be entirely unaware of the Trinity! He did not tell anyone, nor did he make it clear in the Torah. Moses' silence on the Trinity is deafening.
Since Moses received that maximum mortal picture of God, then if Trinitarian theology is true then Moses must have known. But if Moses knew that God was triune, why did Moses not teach the Jews in the desert that fact?
The LORD would speak to Moses face to face, as one man speaks to another. And he would then return to the camp; but his attendant, Joshua son of Nun, a youth, would not stir out of the Tent.
Moses said to the LORD, “See, You say to me, ‘Lead this people forward,’ but You have not made known to me whom You will send with me. Further, You have said, ‘I have singled you out by name, and you have, indeed, gained My favor.’
Now, if I have truly gained Your favor, pray let me know Your ways, that I may know You and continue in Your favor. Consider, too, that this nation is Your people.”
And He said, “I will go in the lead and will lighten your burden.”
And he said to Him, “Unless You go in the lead, do not make us leave this place.
For how shall it be known that Your people have gained Your favor unless You go with us, so that we may be distinguished, Your people and I, from every people on the face of the earth?”
And the LORD said to Moses, “I will also do this thing that you have asked; for you have truly gained My favor and I have singled you out by name.”
He said, “Oh, let me behold Your Presence!”
And He answered, “I will make all My goodness pass before you, and I will proclaim before you the name LORD, and the grace that I grant and the compassion that I show.
But,” He said, “you cannot see My face, for man may not see Me and live.”
And the LORD said, “See, there is a place near Me. Station yourself on the rock
and, as My Presence passes by, I will put you in a cleft of the rock and shield you with My hand until I have passed by.
Then I will take My hand away and you will see My back; but My face must not be seen.”