Hebrews 12:24

Genesis 4:10 NIV
The Lord said, “What have you done? Listen! Your brother’s blood cries out to me from the ground.

Hebrews 11:28 NIV
By faith he kept the Passover and the application of blood, so that the destroyer of the firstborn would not touch the firstborn of Israel.

Hebrews 11:4 NIV
By faith Abel brought God a better offering than Cain did. By faith he was commended as righteous, when God spoke well of his offerings. And by faith Abel still speaks, even though he is dead.

Hebrews 8:6 NIV
But in fact the ministry Jesus has received is as superior to theirs as the covenant of which he is mediator is superior to the old one, since the new covenant is established on better promises.

Hebrews 9:15 NIV
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.