Hebrews 2:3
how shall we escape, if we neglect so great salvation? which at first began to be spoken by the Lord, and was confirmed to us by those who heard him;
Hebrews 6:6
if they fall away; since they again crucify in themselves the Son of God, and put him to an open shame.
Hebrews 9:28
so the Christ was once offered to bear the sins of many; and to those who look for him he will appear the second time, without a sin-offering, in order to salvation.
Hebrews 10:26-29
For if we sin willfully, after we have received the knowledge of the truth, there remains no longer a sacrifice for sins;
Hebrews 12:25
See that you reject not him that speaks: for if they es caped not who rejected that earthly man who gave the oracles, much more shall not we escape, if we turn away from him that is from heaven,