Hebrews 7:22; Hebrews 9:15; Hebrews 9:17

22 Because of this oath, Jesus has become the guarantor of a better covenant.

15 For this reason Christ is the mediator of a new covenant, that those who are called may receive the promised eternal inheritance—now that he has died as a ransom to set them free from the sins committed under the first covenant.

17 because a will is in force only when somebody has died; it never takes effect while the one who made it is living.