G0276–ἀμετάθετος–ametathetos

Wherein God, willing to shew more abundantly to the heirs of the promise the unchangeableness of his purpose, intervened by an oath,

ἀμετάθετον ametatheton “unchangeableness”

that by two unchangeable things, in which [ergänzt: it was] impossible that God should lie, we might have a strong encouragement, who have fled for refuge to lay hold on the hope set before us,

ἀμεταθέτων, ametathetōn “unchangeable,”