What language is the tongue of Angels?
Paul went up to the third heaven and was edified on what the tongue of Angels is:
2 Corinthians 12:1-4
It is not expedient for me doubtless to glory. I will come to visions and revelations of the Lord.
I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: Alahayim knoweth;) such an one caught up to the third heaven.
And I knew such a man, (whether in the body, or out of the body, I cannot tell: Alahayim knoweth;)
How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter.
His account of the words that he heard in the third heaven are in his account known to us as the Apocalypse of Paul.
Apocalypse of Paul Chapter 30
30. And I said to the angel: Sir, what is HaluluYah? And the angel answered and said to me: You ask questions about everything. And he said to me, HaluluYah is said in the Hebrew language of Alahayim and angels, for the meaning of HaluluYah is this: tecel cat. marith macha. And I said, Sir, what is tecel cat. marith macha? And the angel answered and said unto me: “tecel'cat. marith macha” is: Let us all bless him together. I asked the angel and said, Sir, do all who say HaluluYah bless AHAYAH? And the angel answered and said to me: It is so, and again, therefore, if any one sing HaluluYah and those who are present do not sing at the same time, they commit sin because they do not sing along with him, And I said: My Lord, does he also sin if he be hesitating or very old? The angel answered and said unto me: Not so, but he who is able and does not join in the singing, know such as a despiser of the Word, and it would be proud and unworthy that he should not bless AHAYAH Alahayim his maker.
Once Paul was knowledgeable of the fact that Hebrew is the Language of Alahayim and angels, he referred to it as the tongue of angels.
1 Corinthians 13:1
Though I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal.
• One can confirm that Hebrew is the heavenly language because it is the tongue of creation.
And I opened his mouth, and his ears and his lips, and I began to speak with him in Hebrew in the tongue of the creation.
Hebrew was spoken by Adam and all men spoke Hebrew up until the tower of Babel events. At the splitting of the tongues, the Holy Language was retained by Noah, Shem, Eber, and the House of Abraham after the split of the languages at the tower of Babel.
The Appendix of Naphtali 8:4-6
4 For at that time Ahayah, blessed be He, came down from His highest heavens, and brought down with Him seventy ministering angels, Michael at their head.
5 He commanded them to teach the seventy families which sprang from the loins of Noah seventy languages.
6 Forthwith the angels descended and did according to the command of their Creator. But the holy language, the Hebrew language, remained only in the house of Shem and Eber, and in the house of Abraham our father, who is one of their descendants.
The language of Alahayim and his angels continued to be Hebrew in the New Testament by evidence of Yache calling unto Paul from the Heavens.
And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hard for thee to kick against the pricks.
And I said, Who art thou, Lord? And he said, I am Yache whom thou persecutest.
We hope this was edifying to understand that Hebrew is the tongue of Angels.