Midrash sur L’Exode 29:3

Observe that everyone who desired to be worshipped as a divine being constructed a palace for himself in the midst of the sea. Pharaoh erected a palace in the midst of the water and dammed up the water of the Nile to keep it from flowing into the Mediterranean. However, the water rose, undermined the foundations of the palace, lifted it up, and bore it away, as it is said: Speak, and say: “Thus saith the Lord God: Behold, I am against thee, Pharaoh, king of Egypt, the great crocodile that lieth in the midst of his rivers, that hath said: My river is my own” (Exod. 29:3). The Holy One, blessed be He, rebuked him: O wicked one, you were proud upon the waters; through the waters you shall perish, as it is written: But overthrew Pharaoh and his hosts in the Red Sea (Ps. 136:15).