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.