אֶת־קַשְׁתִּ֕י נָתַ֖תִּי בֶּֽעָנָ֑ן וְהָֽיְתָה֙ לְא֣וֹת בְּרִ֔ית בֵּינִ֖י וּבֵ֥ין הָאָֽרֶץ׃
내가 내 무지개를 구름 속에 두었나니 이것이 나의 세상과의 언약의 증거니라
English Explanation of Pirkei Avot
Ten things were created on the eve of the Sabbath at twilight, and these are they: [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 staff [of Moses], [7] the shamir, [8] the letters, [9] the writing, [10] and the tablets. And some say: also the demons, the grave of Moses, and the ram of Abraham, our father. And some say: and also tongs, made with tongs. [1] the mouth of the earth: which swallowed Korah and his congregation (Numbers 16:32). [2] the mouth of the well: that gave the children of Israel water in the desert. (See Numbers 21:16-18). [3] the mouth of the donkey: that spoke to Balaam (Numbers 22:28). [4] the rainbow: that was a sign to Noah (Genesis 9:13). [5] the manna: (Exodus 16:15). [6] the staff [of Moses]: (Exodus 4:17). [7] the shamir: According to rabbinic legend, this was a worm that Solomon used to cut the stones to build the First Temple. See Tosefta Sotah 15:1. [8] the letters: the shape of the letters used to write the Ten Commandments. [9] the writing: See Exodus 32:16. The writing, according to legend, could be seen from all four sides of the tablets. [10] and the tablets: this refers to the first set of the tablets (ibid.) Moses made the second set of tablets (Exodus 34:1). Demons: In the ancient world, people firmly believed in demons, much as we believe in bacteria and viruses even if we have never seen one. These being unnatural phenomenon, must have been created on the twilight of the sixth day. The grave of Moses: Since no one was there for Moses’s burial, we could surmise that it was not created by any human being (Deuteronomy 34:6). And the ram of Abraham, our father: which seemed to have miraculously appeared before Abraham sacrificed Isaac (Genesis 22:13). The mishnah teaches that God all along created the ram to be sacrificed in Isaac’s place. Otherwise it might seem that if the ram had not gotten caught in the bushes, Abraham would have been allowed to sacrifice his son. Tongs made with tongs: One cannot forge tongs in fire, without already having a set of tongs. The first set of tongs must therefore have been made during the twilight of the sixth day. Why do you think that the mishnah divides its list into three parts, a list, then a list of three and then one last item? Why aren’t miracles such as the splitting of the sea and the standing still of the sun mentioned here?
Rabbeinu Yonah
and the rainbow: "My rainbow have I given in the cloud" (Genesis 9:13).
Ibn Ezra
And He placed - Do not be astonished over the word "and He placed," for it is also written, "My bow have I placed" (Genesis 9:13).