12Then you will know that I the LORD have heard all the contemptible things you have said against the mountains of Israel. You said, “They have been laid waste and have been given over to us to devour.” 13You boasted against me and spoke against me without restraint, and I heard it. 14This is what the Sovereign LORD says: While the whole earth rejoices, I will make you desolate. 15Because you rejoiced when the inheritance of Israel became desolate, that is how I will treat you. You will be desolate, Mount Seir, you and all of Edom. Then they will know that I am the LORD .’ ”