Midrash su Giobbe 40:25

When R. Dimi came from Palestine, he said in the name of R. Jonathan, what is the meaning of the passage (Ps. 24, 2) For upon seas he hath founded it, and upon rivers he hath established it? i.e. the seven seas and four rivers which surround the land of Israel (Palestine), the seven seas are the seas of Tiberia, Sodom, Chirat, Chiltha, Sipchi, Aspamia, and the ocean; and the four rivers are Jordan, Jarmuch, Kirumyun, and Phiga." When R. Dimi came, he said in the name of R. Jonathan: "In the future the angel Gabriel (Fol. 75) will go hunting for the leviathan, as it is said (Job 40, 25) Canst thou draw out the crocodile (leviathan) with a fishhook or cause his tongue to sink into the baited rope? And if not for the help of the Holy One, praised be He! he would not conquer him, as it is said (Ib.) He is the first in rank … he that hath made him can alone bring his sword near to him." When R. Dimi came, he said also in the name of R. Jochanan: "When the leviathan becomes hungry, he expels from his mouth a gas which makes all the waters in the deep boil, as it is said (Ib. 41, 23) He maketh the deep to boil like a pot. And should he put his head in paradise, not one of the creatures could withstand the bad smell of the gas, as it is said (Ib.) He maketh the sea like a seething mixture. And when he gets thirsty, he makes the sea hollow like beds, as it is said: Behind him he causeth his pathway to shine." And R. Acha b. Jacob said: "The deep does not come to its natural way before seventy years, as it is said (Ib.) Men esteem the deep to be hoary — and hoary is not less than seventy years."

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).