G0276–ἀμετάθετος–ametathetos

Wherein God, willing more abundantly to show to the heirs of promise the immutability of his counsel, confirmed it by an oath:

ἀμετάθετον ametatheton “unchangeableness”

That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:

ἀμεταθέτων, ametathetōn “unchangeable,”