What does 2 Kings 9:26 mean?

Jehu continued, The Lord said, I saw what happened to Naboth and his sons, and I’ll make you pay for it in this very field. So throw Joram’s body there, just as the Lord said. 2 Kings 9:26 - Modern Text Bible

(Jehu makes it clear that this is God’s judgment for past crimes, not just his own revenge.)