Hebrews 6:16-18

ECB(i) 16 For humanity indeed oaths by the greater: and an oath establishes a finality of all controversy. 17 Wherein Elohim willed more superabundantly to show the heirs of pre-evangelism the immutability of his counsel, he confirmed it by an oath: 18 that through two immutable matters, in which it is impossible for Elohim to lie, we who fled for refuge, have a mighty consolation to empower the hope set in front of us: