Hebrews 6:17 In the same way, since it was God's desire to display more convincingly to the heirs of the promise how unchangeable His purpose was, (WEY DBY NAS RSV)
Hebrews 6:18 He added an oath, in order that, through two unchangeable things, in which it is impossible for Him to prove false, we may possess mighty encouragement--we who, for safety, have hastened to lay hold of the hope set before us. (WEY DBY NAS RSV NIV)
Hebrews 7:24 But he, because he lives forever, has his priesthood unchangeable. (WEB KJV ASV DBY WBS)
Job 23:13 But he stands alone, and who can oppose him? What his soul desires, even that he does. (See RSV)