Midrash su Deuteronomio 1:5

(Deut. 1:1:) “These are the words that Moses spoke….” Israel said, “Yesterday you said (in Exod. 4:10), ‘I am not a man of words.’ And now you are speaking so much?” Rabbi Isaac said, “If you are impeded in your speech, recite the Torah and you will be healed, [as] Moshe already studied all of the Torah.” (Deut. 1:1, cont.:) “Through the wilderness, in the Arabah near Suph.” This text is related (to Is. 35:6), “Then the lame shall leap like a hart, and the tongue of the dumb shall shout for joy.” Come and see. When the Holy One, blessed be He, said to Moses (in Exod. 3:10), “I will send you unto Pharaoh,” Moses said to Him, “You are doing me an injustice.²Gk.: bia. (Exod. 4:10), ‘I am not a man of words.’” He said to Him, “Seventy languages are spoken in Pharaoh's palace.³Palterin. Gk.: praitorion; Lat. praetorium. Thus if a man comes from another place, they speak with him in his own language. When I go on Your mission, they will examine me, asking whether I am a representative of the Omnipresent. Then it will be revealed to them that I do not know how to converse with them. Will they not laugh at me, saying, ‘Look at the agent of the One who created the world and all its languages! Does he not know how to listen and reply?’ See here, something is wrong!⁴Gk.: bia. (Exod. 4:10:) ‘I am not a man of words,’ (Exod. 6:12) ‘For I have uncircumcised lips (i.e., a speech impediment).’” The Holy One, blessed be He, said to him, “But look at the first Adam. Since no creature taught him, where did he [come to] know seventy languages? It is so stated (in Gen. 2:20), ‘And he gave names to (them).’ ‘A name for every beast’ is not written here but rather ‘names’ (in the plural, i.e., a name for each and every beast in seventy languages). And you say, (Exod. 4:10) ‘I am not a man of words.’” At the end of forty years [from] when Israel left Egypt, [Moses] began to elucidate the Torah in seventy languages, as stated (in Deut. 1:5), “he elucidated this Torah.” The mouth that said (in Exod. 4:10), “I am not a man of words,” [then] said (in Deut. 1:1), “These are the words.” The prophet [thus] cries out and says (in Is. 35:6), “Then the lame shall leap like a hart, and the tongue of the dumb shall shout for joy.” Why? (Ibid., cont.:) “Because waters shall break forth in the wilderness and streams in the desert.” It is therefore stated (in Deut. 1:1), “These are the words.”

(Devarim 1:5) "Across the Jordan, in the land of Moav, Moses ho'il (began) to explain": "hoalah" is "beginning," as in (Judges 19:6) "Begin ("hoel") now and stay overnight so that you will be refreshed," and (I Chronicles 17:27) "and now you have begun ("hoalta") to bless the house of your servant to be before You forever." And the sages say: "hoalah" is "swearing," as in (Shemoth 2:21) "And Moses swore ("vayoel") to remain with the man," and (I Samuel 14:24) "And Saul beswore ("vayoel") the people, saying 'Cursed be the man who will eat bread until the evening when I will be avenged of my enemies.'"

Thus it is to be found that there were three kinds of stones, one was that which Moses erected on this side of the Jordan, as it is said (Deut. 1, 5) And this side of the Jordan, in the land of Moab, began Moses to explain this law and it is said further, (Ib. 27, 8) And thou shalt write upon the stones all the words of Ba'er [to explain], and we infer through analogy applying the similar word Ba'er used in both places. Another kind of stone was that which Joshua set up in the Jordan, as it is said (Josh. 4, 9) Twelve stones also did Joshua set up in the midst of the Jordan; and the third are the stones which Joshua set up in Gilgal, as it is said (Ib., ib., 20) And those twelve stones, which they had taken out of the Jordan, did Joshua set up in Gilgal.

Our masters have taught: Sihon was as strong as a wall tower.³²See above, Deut. 1:5; M. Pss. 136:11. When he sat on the wall his feet reached to the ground, and there was no creature on earth able to stand against him. So what did the Holy One do? He bound his guardian angel (SRW SL M'LH, rt.: 'LH), cast him down, and deliverered him into the hand of Moses. It is so stated (with reference to the Amorite in Amos 2:9, cont.): I DESTROYED HIS FRUIT ABOVE (MM'L, rt.: 'LH) AND HIS ROOTS BELOW, i.e., his seed. Why? Because the Holy One foresaw his children and his children's children up to the resurrection that not one of them would fear Heaven, he immediately cut off his seed. But how did the Amorites die? Rabbi Levi said: The Holy One prepared two hornets for each and every one of them, as stated (in a literal translation of Deut. 7:20): MOREOVER, THE LORD [YOUR] GOD WILL SEND THE HORNET AMONG THEM. Now the hornet flies and smites one in the midst of his eye. Then immediately his eye drops out and he dies. And this is what David said (in Ps. 44:4 [3]): FOR THEY DID NOT TAKE POSSESSION OF THE LAND WITH THEIR OWN SWORD, NOR DID THEIR MIGHTY ARM DELIVER THEM…. If you had not helped them they would not have overcome them. So for that reason, when Moses saw them, he was afraid of them, until the Holy One said to him: Do not be afraid of them. The sages have said: Sihon and Og were stronger than Pharaoh and his armies; for just as they uttered a song over the fall of Pharaoh and his army, so were they worthy to utter <a song> over Sihon and Og. It is simply that David came and uttered a song over them (in Ps. 136:19–20): SIHON, KING OF THE AMORITES, FOR HIS STEADFAST LOVE ENDURES FOREVER; AND OG, KING OF BASHAN, FOR HIS STEADFAST LOVE ENDURES FOREVER.

...Rabbi Berechya, Rabbi Chiya, and the Rabbis "from there" [Babylonia] stated in the name of Rabbi Yehudah: Not a day passes that the Holy and Blessed One does not innovate some halacha in the heavenly court. What is the reason [prooftext]? As it is written: "Listen, listen to the roar of His voice, to the sound (hegeh) that issues from His mouth" (Job 37:2). And hegeh is none other than Torah, as it is written "meditate (v'hegita) on it day and night" (Joshua 1:8). And even these halachot was known by our father Abraham.