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Our verse says that his Tefilah is in Divrei Malchei Yisrael. Verse 19 says that it is written in Divrei Chozai!
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Malbim: Our verse discusses his prayer [to idolatry] when he was incarcerated; it is Chulin. Verse 19 discusses his prayer to Hashem; it is Kadosh. I explained (Tehilim 66:1) that it is in Tehilim 66.
