Matthew 20:28

even as the Son of man came, not to be ministered to, but to minister, and to give his life a ransom for many.

Revelation 5:9

And they sung a new song, saying: Thou art worthy to take the book, and to open its seals: for thou wast slain, and hast redeemed us to God by thy blood, out of every tribe and tongue and people and nation:

Treasury of Scripture Knowledge

Summary

Only be sure that thou eat not the blood: for the blood is the life; and thou mayest not eat the life with the flesh.

Bible References

The blood is

Matthew 20:28
even as the Son of man came, not to be ministered to, but to minister, and to give his life a ransom for many.
Revelation 5:9
And they sung a new song, saying: Thou art worthy to take the book, and to open its seals: for thou wast slain, and hast redeemed us to God by thy blood, out of every tribe and tongue and people and nation: