Where in the Bible does it say "I will destroy those who destroy My land"? Where in the Bible does it say "I (God) will destroy those who destroy My land"?
You may be thinking of Jeremiah 16:18:


  I will repay them double for their wickedness and their sin, because they have defiled my land with the lifeless forms of their vile images and have filled my inheritance with their detestable idols.


(NIV)

That's the closest thing I was able to come up with on a BibleHub.com search.