Mishnayos Avos Perek 5 Mishnah 6

At twilight: on the eve of the Shabbat of creation, before the creation was completed.

The mouth of the earth: to swallow Korach and his congregation.

and the mouth of the well: The well of Miriam that went with Israel in the wilderness on all of the journeys. And some say, that it opened its mouth and uttered song, as it stated (Numbers 21:17), "rise up, O well; answer it."

and the mouth of the donkey: At twilight it was decreed about it that it should speak with Bilaam.

and the rainbow: as a sign of the covenant that there would not be another flood.

and the manna: that descended for Israel for forty years in the wilderness.

and the staff [of Moshe]: with which the signs were preformed. And it was [made] of sapphire.

and the shamir: It is like a type of worm, the [size of a grain of] barley in its entirety. When they would [place] it on the stones that were marked with ink [to demark what they wanted cut, the stones] would become indented on their own. And with it did they engrave the stones of the vest (ephod) and the breastplate, as it is written about them, "in their fullness."

the letters: The shape of the letters that were engraved on the tablets;

the writing: that they could be read from all four sides.

the tablets: were [made] of sapphire. Their length was six and their width was six and their thickness was three, like a stone whose length, width and thickness are equal and it was split into two. And they were soft and they were quarried from the ball of the sun.

also the destructive spirits: These are the shedim (demons). As after the Holy One, blessed be He, created Adam and Chava, he was involved in their creation. And when He created their spirits, He did not suffice to create their bodies before the [Shabbat] day was sanctified (began), and they remained spirits without a body.

and the ram of Avraham, our father: It was decreed about it at twilight that it would be stuck in the thicket by its horns at the time of the binding [of Yitschak].

also the tongs (tsevat), made with tongs: The [Aramaic] translation of (Numbers 4:9) "its tongs" is tsivtaha. The tongs can only be made with other tongs - and [so,] who made the first ones? Perforce they were made by themselves by the hand of Heaven; and they were created at twilight. And this was pushed off in the gemara in the chapter [entitled] Makom she'Nahagu (Pesachim 54a); and they said it is possible that the first tongs were made in a mold, as they cut the copper [for the tongs] with fire and cast it into the mold and it immediately became tongs.