John Calvin Commentary Jeremiah 48:25

"The horn of Moab is cut off, and his arm is broken, saith Jehovah." — Jeremiah 48:25 (ASV)

By another metaphor, he expresses the same thing. By horn he means power, as all who are somewhat familiar with Scripture well know that this word signifies power, strength, or any defense for a nation's protection.

He then says that the horn of Moab was cut off; and he adds afterwards, as an explanation, that his strength was broken. Therefore, by this second clause, we understand what the Prophet meant when he said that the horn of Moab was cut off.

But he again introduces God as the speaker because the Moabites thought that their horn could not be broken. Since Jeremiah would not have been believed if he had spoken in his own name, he again presented God as declaring his own words.