Psalm 74¹⁴ Thou brakest the heads of leviathan in pieces, and gavest him to be meat to the people inhabiting the wilderness.

Psalm 74:14 may be a future prophecy of someone from the house of Jacob talking about what happens in the period of the book of Revelation and Isaiah 27 or sometime after.

Psalm 104²⁵ So is this great and wide sea, wherein are things creeping innumerable, both small and great beasts. ²⁶ There go the ships: there is that leviathan, whom thou hast made to play therein. ²⁷ These wait all upon thee; that thou mayest give them their meat in due season.

Psalm 104:25 is someone from the house of Jacob saying it hasn’t happened yet, and people are waiting for it to happen.

Revelation 13 And I stood upon the sand of the sea, and saw a beast rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy. ² And the beast which I saw was like unto a leopard, and his feet were as the feet of a bear, and his mouth as the mouth of a lion: and the dragon gave him his power, and his seat, and great authority.

Isaiah 27 In that day the Lord with his sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and he shall slay the dragon that is in the sea.