Genesis 32:12

Heaven and earth will pass away, but my words will not pass away.

if we are faithless, he remains faithful, for he cannot deny himself.

in the hope of eternal life, which God, who cannot lie, promised long ages ago,

So when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he interposed with an oath,

Treasury of Scripture Knowledge

And thou saidst, I will surely do thee good, and make thy seed as the sand of the sea, which cannot be numbered for multitude.

Heaven and earth will pass away, but my words will not pass away.

if we are faithless, he remains faithful, for he cannot deny himself.

in the hope of eternal life, which God, who cannot lie, promised long ages ago,

So when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he interposed with an oath,