John Calvin on Ezekiel 17:18

Ezekiel repeals again, that, even speaking, Zedekiah could not succeed, since he violated the treaty for we yesterday said that this persuasion is always fixed in men’s minds, that treaties are sacred, and cannot be broken with impunity. Since, therefore, the sacredness of treaties was always prevalent among men, Ezekiel here pronounces that the issue would be disastrous, because Zedekiah despised his oath when he broke the treaty after stretching out his hand. He describes a gesture, as I think, customary among men — that of stretching forth the hand when they wish to witness a covenant. The alliance, then, between the Egyptians and the Jews is here described by an outward gesture, because Zedekiah stretched forth his hand, and yet had violated it in this way: but since he perfidiously revolted from King Nebuchadnezzar, to whom he had pledged his faith, he has done all this, says he, therefore he shall not be liberated. It follows —

Ezekiel 17:19

19. Therefore thus says the Lord GOD; As I live, surely mine oath that he hath despised, and my covenant that he hath broken, even it will I recompense upon his own head.

19. Propterea sic dicit Dominator Iehovah, Vivo ego, si non jusjurandum meum quod sprevit, et foedus meum quod irritum fecit, rependam Or, “I will throw it back.” — Calvin. in ejus caput.