I will strengthen the arms of the king of Babylon, but the arms of Pharaoh shall fall. Then they shall know that I am the LORD, when I put my sword into the hand of the king of Babylon and he stretches it out against the land of Egypt.
This short prophecy of the weakening of the power of Egypt was delivered about the time that the army of the Egyptians, which attempted to raise the siege of Jerusalem, was frustrated in its enterprises, and returned re infect - without accomplishing their purpose; whereupon the king of Babylon renewed the siege and carried his point. The kingdom of Egypt was very ancient, and had been for many ages considerable.
Commenting on Ezekiel 30:20-26
But I will strengthen the arms of the king of Babylon,.... Which is repeated for the sake of confirmation: and the arms of Pharaoh shall fall down: as when a man's arms are broken; and he shall not be able to lift them up and defend himself: and they shall know that I am the Lord; namely, the Egyptians, as in Eze 30:19, when I...
But I will strengthen the arms of the king of Babylon, and the arms of Pharaoh shall fall down; and they shall know that I [am] the LORD, when I shall put my sword into the hand of the king of Babylon, and he shall stretch it out upon the land of Egypt.