Hebrews 6:16-18

Complete Jewish Bible

¹⁶ Now people swear oaths by someone greater than themselves, and confirmation by an oath puts an end to all dispute. ¹⁷ Therefore, when God wanted to demonstrate still more convincingly the unchangeable character of his intentions to those who were to receive what he had promised, he added an oath to the promise; ¹⁸ so that through two unchangeable things, in neither of which God could lie, we, who have fled to take a firm hold on the hope set before us, would be strongly encouraged.