Hebrews 6:15-17

New Revised Standard Version, Anglicised Catholic Edition

¹⁵ And thus Abraham,^[a] having patiently endured, obtained the promise. ¹⁶ Human beings, of course, swear by someone greater than themselves, and an oath given as confirmation puts an end to all dispute. 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,