en_tn/ezk/17/19.md

was it not my oath that he despised and my covenant that he broke?

Yahweh asks this leading question to emphasize the affirmative answer. This question can be translated as a statement. Alternate translation: "it was my oath that the king of Jerusalem despised and my covenant that he broke." (See: rc://en/ta/man/translate/figs-rquestion)

I will bring his punishment on his head

The idiom "bring ... on his head" means that he will experience this punishment. See how you translated this idiom in Ezekiel 11:21. Alternate translation: "I will cause him to suffer his punishment" (See: rc://en/ta/man/translate/figs-idiom)