Commentaries:
Jamieson, Fausset, and Brown
the king's—Jehovah, peculiarly the king of Israel in the theocracy; Ecclesiastes 8:3-4, prove it is not the earthly king who is meant.
the oath of God—the covenant which God made with Abraham and renewed with David; Solomon remembered Psalms 89:35, "I have sworn," etc. (Psalms 89:36), and the penalties if David's children should forsake it (Psalms 89:30-32); inflicted on Solomon himself; yet God not "utterly" forsaking him (Psalms 89:33-34).
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