Sigh, your assertion that the Scriptures are merely inspired except when God is being quoted says mountains about your theology, traditions, magisterium, etc. For many of us, the Scriptures cannot be cherry picked. Nevertheless, to play the game by your rules of engagement, Moses was given the utterance of the song - Ha'azinu (Deuteronomy 32) - in this command spoken by God:
Now therefore write ye this song for you, and teach it the children of Israel: put it in their mouths, that this song may be a witness for me against the children of Israel. – Deut 31:19
Such songs are divine in origin --- witness the many songs of David, especially Psalms 22 --- even when uttered by a heathen such as Nebuchadnezzar in Daniel 4 when he had received a vision. And note what happened to Herod when he tried to take credit for his oration:
And upon a set day Herod, arrayed in royal apparel, sat upon his throne, and made an oration unto them. And the people gave a shout, [saying, It is] the voice of a god, and not of a man. And immediately the angel of the Lord smote him, because he gave not God the glory: and he was eaten of worms, and gave up the ghost. – Acts 12:21-23
Now Moses was facing physical death at the very moment he sang the song because he struck the Rock twice to extract the water for the people of Israel.:
And the LORD spake unto Moses, saying, Take the rod, and gather thou the assembly together, thou, and Aaron thy brother, and speak ye unto the rock before their eyes; and it shall give forth his water, and thou shalt bring forth to them water out of the rock: so thou shalt give the congregation and their beasts drink. And Moses took the rod from before the LORD, as he commanded him. And Moses and Aaron gathered the congregation together before the rock, and he said unto them, Hear now, ye rebels; must we fetch you water out of this rock? And Moses lifted up his hand, and with his rod he smote the rock twice: and the water came out abundantly, and the congregation drank, and their beasts [also].
And the LORD spake unto Moses and Aaron, Because ye believed me not, to sanctify me in the eyes of the children of Israel, therefore ye shall not bring this congregation into the land which I have given them. – Numbers 20:7-12
As with the Temple, the Ark, the Garden of Eden/Paradise, the serpent being lifted up – and here with the Rock and the Water – the physical is a "type" of the spiritual. Note the "types" here. God is the Rock. Jesus is God with us (Immanuel). The Holy Spirit is the living water.
Behold, I will stand before thee there upon the rock in Horeb; and thou shalt smite the rock, and there shall come water out of it, that the people may drink. And Moses did so in the sight of the elders of Israel. And he called the name of the place Massah, and Meribah, because of the chiding of the children of Israel, and because they tempted the LORD, saying, Is the LORD among us, or not?– Exodus 17:6-7 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea; And were all baptized unto Moses in the cloud and in the sea; And did all eat the same spiritual meat; And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ. – 1 Cor 10:1-4
For my people have committed two evils; they have forsaken me the fountain of living waters, [and] hewed them out cisterns, broken cisterns, that can hold no water. – Jer 2:13
Jesus answered and said unto her, If thou knewest the gift of God, and who it is that saith to thee, Give me to drink; thou wouldest have asked of him, and he would have given thee living water. – John 4:10
He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water. – John 7:38
These are Spiritual Truths hidden in plain sight. Thus Moses calls all of Creation to witness the song God gave to him as follows:
Give ear, O ye heavens, and I will speak; and hear, O earth, the words of my mouth. My doctrine shall drop as the rain, my speech shall distil as the dew, as the small rain upon the tender herb, and as the showers upon the grass: Because I will publish the name of the LORD: ascribe ye greatness unto our God. [He is] the Rock, his work [is] perfect: for all his ways [are] judgment: a God of truth and without iniquity, just and right [is] he. – Deu 32:1-4
We ought to pray and meditate over every word of this. It will be sung in heaven. (Rev)