Charles Ellicott Commentary Jeremiah 48:29

"We have heard of the pride of Moab, [that] he is very proud; his loftiness, and his pride, and his arrogancy, and the haughtiness of his heart." — Jeremiah 48:29 (ASV)

We have heard the pride of Moab ... — It will be seen that here and in the next verse the very words of Isaiah (Isaiah 16:6) are reproduced. The prophet seems to find a pleasure in going back to the old words as showing that the fault of which he spoke was inveterate, and had shown itself incurable. It is, however, a free reproduction, and Jeremiah, instead of making the whole utterance that of the Jews, inserts the words, I know his wrath, saith the Lord, which come as an oracle from God, affirming the judgment of the people.