Midrash su Salmi 104:5

Whence do we know that Gehenna was created on the second day? From the verse For a hearth is ordered of yesterday (Isa. 30:33). It was the day on which a man could refer only to yesterday and not to “the day before yesterday.” When could a man refer to yesterday? Only on the second day (of Creation), which was preceded by the first day of the week. After that He created the dry land on the third day of the week, as it is said: Who didst establish the earth upon its foundations, that it should never be moved forever and ever (Ps. 104:5). He covered one part of the world, and uncovered another. To what may this be compared? To a man who owns two slaves, and strips the clothing from one in order to cloth the other. The Holy One, blessed be He, did likewise. He gathered the waters beneath the heavens to one place, and in that way uncovered the earth while covering the deep, as it is said: Thou didst cover the deep as with a vesture (ibid., v. 6).

The fish said to Jonah, Dost thou not know that my day had arrived to be devoured in the midst of Leviathan's mouth? Jonah replied, Take me beside it, and I will deliver thee and myself from its mouth. It brought him next to the Leviathan. (Jonah) said to the Leviathan, On thy account have I descended to see thy abode in the sea, for, moreover, in the future will I descend and put a rope in thy tongue, and I will bring thee up and prepare thee for the great feast of the righteous. (Jonah) showed it the seal of our father Abraham (saying), Look at the Covenant (seal), and Leviathan saw it and fled before Jonah a distance of two days' journey. (Jonah) said to it (i.e. the fish), Behold, I have saved thee from the mouth of Leviathan, show me what is in the sea and in the depths. It showed him the great river of the waters of the Ocean, as it is said, "The deep was round about me" (Jonah 2:5), and it showed him the paths of the Reed Sea through which Israel passed, as it is said, "The reeds were wrapped about my head" (ibid.); and it showed him the place whence the waves of the sea and its billows flow, as it is said, "All || thy waves and thy billows passed over me" (Jonah 2:3); and it showed him the pillars of the earth in its foundations, as it is said, "The earth with her bars for the world were by me" (Jonah 2:6); and it showed him the lowest Sheol, as it is said, "Yet hast thou brought up my life from destruction, O Lord, my God" (ibid.); and it showed him Gehinnom, as it is said, "Out of the belly of Sheol I cried, and thou didst hear my voice" (Jonah 2:2); and it showed him (what was) beneath the Temple of God, as it is said,"(I went down) to the bottom of the mountains" (Jonah 2:6). Hence we may learn that Jerusalem stands upon seven (hills), and he saw there the Eben Shethiyah (Foundation Stone) fixed in the depths. He saw there the sons of Korah standing and praying over it. They said to Jonah, Behold thou dost stand beneath the Temple of God, pray and thou wilt be answered. Forthwith Jonah said to the fish, Stand in the place where thou art standing, because I wish to pray. The fish stood (still), and Jonah began to pray before the Holy One, blessed be He, and he said: Sovereign of all the Universe ! Thou art called "the One who kills" and "the One who makes alive," behold, my soul has reached unto death, now restore me to life. He was not answered until this word came forth from his mouth, "What I have vowed I will perform" (Jonah 2:9), namely, I vowed to draw up Leviathan and to prepare it before Thee, I will perform (this) on the day of the Salvation of Israel, as it is said, "But I will sacrifice unto thee with the voice of thanksgiving" (ibid.). Forthwith the Holy One, blessed be He, hinted (to the fish) and it vomited out Jonah || upon the dry land, as it is said, "And the Lord spake unto the fish, and it vomited out Jonah upon the dry land" (Jonah 2:10).