Psalms 136:20 Midrash

וּ֭לְעוֹג מֶ֣לֶךְ הַבָּשָׁ֑ן כִּ֖י לְעוֹלָ֣ם חַסְדּֽוֹ׃

And Og king of Bashan, For His mercy endureth for ever;