Avot 5:6 Midrash : Legends, Midrash Lekach Tov, Midrash Tanchuma & Pirkei DeRabbi Eliezer

The shamir was made at twilight on the sixth day of creation together with other extraordinary things. It is about as large as a barley corn, and it possesses the remarkable property of cutting the hardest of diamonds. For this reason it was used for the stones in the breastplate worn by the high priest. First the names of the twelve tribes were traced with ink on the stones to be set into the breastplate, then the shamir was passed over the lines, and thus they were graven. The wonderful circumstance was that the friction wore no particles from the stones. The shamir was also used for hewing into shape the stones from which the Temple was built, because the law prohibited iron tools to be used for the work in the Temple. The shamir may not be put in an iron vessel for safe-keeping, nor in any metal vessel, it would burst such a receptacle asunder. It is kept wrapped up in a woollen cloth, and this in turn is placed in a lead basket filled with barley bran. The shamir was guarded in Paradise until Solomon needed it. He sent the eagle thither to fetch the worm. With the destruction of the Temple the shamir vanished. A similar fate overtook the tahash, which had been created only that its skin might be used for the Tabernacle. Once the Tabernacle was completed, the tahash disappeared. It had a horn on its forehead, was gaily colored like the turkey-cock, and belonged to the class of clean animals. Among the fishes there are also wonderful creatures, the sea-goats and the dolphins, not to mention leviathan. A sea-faring man once saw a sea-goat on whose horns the words were inscribed: "I am a little sea-animal, yet I traversed three hundred parasangs to offer myself as food to the leviathan." The dolphins are half man and half fish; they even have sexual intercourse with human beings; therefore they are called also "sons of the sea," for in a sense they represent the human kind in the waters.

"That God created to do/make." These are the ten things that were created on the eve of the Sabbath at twilight: [1] the mouth of the earth, [2] the mouth of the well, [3] the mouth of the donkey, [4] the rainbow, [5] the manna, [6] the letters, [7] the writing, [8] the tablets, [9] the grave of Moses and [10] the ram of Abraham, our father. [...] For all these God created to do miracles and mighty deeds. [...]

(Numb. 20:14:) “Then Moses sent messengers [from Kadesh unto the king of Edom], ‘Thus says your brother Israel….’” This text is related (to Ps. 15:3), “nor takes up a reproach against his relative.” By universal custom, when a person is engaged in business¹⁰⁴Gk.: pragmateia. with his friend who causes a loss, he separates himself from him and does not want to see him.¹⁰⁵Numb. R. 19:15. But although Moses was punished because of Israel, as stated (in Ps. 106:32), “And they provoked wrath at the Waters of Meribah and it went ill with Moses on their account,” he did not unload their burden from himself. Instead (according to Numb. 20:14), “Then Moses sent messengers.”
(Numb. 20:14, cont.:) “You know all the trouble that has befallen us.” They said to him, “You know when the Holy One, blessed be He, said to Abraham (in Gen. 15:13), ‘know full well that your seed shall be alien [in a land not theirs where they shall serve them and be oppressed by them],’ it was us who have been enslaved, while you are free.” (Numb. 20:15:) “How our forefathers went down to Egypt [...].” This whole subject is comparable to two brothers against whose grandfather a promissory note appeared. One of them arose and paid it. One day he started to ask a favor from his brother, and he said to him, “You know that debt was incumbent on both of us, but it was I who paid it. Do not refuse any of my favor that I am asking.” (Numb. 20:15:) “How our forefathers went down to Egypt.” What is the relevance of [mentioning] the forefathers here, as stated (in Numb 20:15, cont.), “the Egyptians dealt harshly with us and our forefathers.” [It is] to teach you that all the time that Israel is in distress, [the forefathers] are also in distress. (Numb. 20:17:) “Please let us pass through your land; [we will not pass through field or vineyard,] nor shall we drink water from a well.” Should it not have said, "water from cisterns?" [By this use of the singular, “a well”], the Torah has taught you proper conduct, [i.e.,] that though one has at hand his necessities, when he who goes to a land which is not his own, he should not eat from what he has on hand. Rather he should put aside what he has, and buy from the shopkeeper in order to benefit him. So also Moses said to [Edom], “[We have] a well with us,¹⁰⁶On the tradition of Israel’s portable well for supplying them with water during their desert wanderings, see Numb. R. 1:2; TSuk. 3:11; Targum Pseudo-Jonathan, Numb. 21:16-18; Frag. Jerusalem Targum, Numb. 21:17-18; Tanh., Lev. 7:7; Lev. R. 25:5; 27:6; see also Avot 5:6; Mekhilta deRabbi Ishmael, Wayassa‘ 6, on Exod. 16:32; Shab. 35a; Pes. 54a; Targum Pseudo-Jonathan, Numb. 22:28; in addition, see TSot. 11:8 (10); Ta‘an. 9a; BM 86b; Cant. R. 4:14:1; Seder ‘Olam Rabbah, 10; cf. I Corinthians 10:4. and we eat our own manna; [but] do not say that we are a bother to you. You will make a profit for yourselves.” So also did the Holy One, blessed be He, say to Moses (in Deut. 2:6), “Food shall you procure from them with money, and you shall eat.” And Moses said to Israel, “Open your money to them. So that they do not say, ‘They were slaves and indigents,’ show them your wealth.” They will [then] know, so that they would not say, “You lost by your subjugation.” As the Holy One, blessed be He, already said (in Gen. 15:14), “and in the end they shall go free with great wealth.” And they shall know that you are not lacking anything and that it is not from [that which is] yours that you are [spending], as stated (in Deut. 2:7), “For the Lord has blessed you in all the efforts of your hand....” (Numb. 20:17, cont.:) “We shall go along the king's highway,” since we restrain¹⁰⁷Hosemin. The word also means “muzzle.” our cattle. (Numb. 20:17, cont.:) “Without turning right or left.” This was the most difficult [stipulation] of them all, for they said, “In all [the lands] around us we have permission to plunder and kill, but within your border [we shall walk the king's highway] without turning right or left [until we have passed through your territory].”