Hebrews 2:2; Hebrews 9:15

Hebrews 2:2

2 For since the message spoken through angels was binding, and every violation and disobedience received its just punishment,

Hebrews 9:15

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.