Charles Ellicott Commentary Ezekiel 29:9

"And the land of Egypt shall be a desolation and a waste; and they shall know that I am Jehovah. Because he hath said, The river is mine, and I have made it;" — Ezekiel 29:9 (ASV)

Because he has said.— Again, as in Ezekiel 29:6, the division of the verses is very unfortunate. The expression shall know that I am the Lord, so common in Ezekiel, always closes a train of thought. The new sentence begins with the reason for the judgment upon Egypt—because of its pride.