'Unchangeable' in the Bible
But He is unchangeable; who can oppose Him? He does what He desires.
For I have said, Mercy and loving-kindness shall be built up forever; Your faithfulness will You establish in the very heavens [unchangeable and perpetual].
Because God wanted to show His unchangeable purpose even more clearly to the heirs of the promise, He guaranteed it with an oath,
so that through two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to seize the hope set before us.