Hebrews 7:22

22This makes Jesus the guarantor of aa better covenant.

Hebrews 9:15-17

15Therefore he is bthe mediator of a new covenant, so that cthose who are called may dreceive the promised eternal inheritance, esince a death has occurred that redeems them from the transgressions committed under the first covenant.
The Greek word means both  covenant and will; also verses 16, 17
16For where a will is involved, the death of the one who made it must be established. 17For ga will takes effect only at death, since it is not in force as long as the one who made it is alive.

Hebrews 9:20

20saying, hThis is the blood of the covenant that God commanded for you.”

Revelation of John 11:19

19Then iGod’s temple in heaven was opened, and jthe ark of his covenant was seen within his temple. There were flashes of lightning, rumblings,
Or voices, or sounds
peals of thunder, an earthquake, and lheavy hail.

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