Hebrews 6:17-19

New Revised Standard Version, Anglicised Catholic Edition

¹⁷ In the same way, when God desired to show even more clearly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it by an oath, ¹⁸ so that through two unchangeable things, in which it is impossible that God would prove false, we who have taken refuge might be strongly encouraged to seize the hope set before us. ¹⁹ We have this hope, a sure and steadfast anchor of the soul, a hope that enters the inner shrine behind the curtain,