Hebrews 6:16-18

Amplified Bible, Classic Edition

¹⁶ Men indeed swear by a greater [than themselves], and with them in all disputes the oath taken for confirmation is final [ending strife].

¹⁷ Accordingly God also, in His desire to show more convincingly and beyond doubt to those who were to inherit the promise the unchangeableness of His purpose and plan, intervened (mediated) with an oath.

¹⁸ This was so that, by two unchangeable things [His promise and His oath] in which it is impossible for God ever to prove false or deceive us, we who have fled [to Him] for refuge might have mighty indwelling strength and strong encouragement to grasp and hold fast the hope appointed for us and set before [us].