What is the blood of Jesus meant to do?
The only valid use to which you put the blood of Jesus to is for the remission or cleansing from sins as seen in the outlined scriptures. It does not in any way meant to be used as a tool to combat the enemy which has already been conquered by the privilege of the new birth.
1 John 1:7 - But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
Matthew 26:28 - For this is my blood of the new testament, which is shed for many for the remission of sins.
Hebrews 9:22 - And almost all things are by the law purged with blood; and without shedding of blood is no remission.
Hebrews 9:12 - Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption [for us].
Revelation 12:11 - And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
Matthew 26:28 - For this is my blood of the new testament, which is shed for many for the remission of sins.
Hebrews 9:22 - And almost all things are by the law purged with blood; and without shedding of blood is no remission.
Hebrews 9:12 - Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption [for us].
Revelation 12:11 - And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
It is not used for fighting at all, even under the old convenant it was not made for pleading and anyone found with the blood of sprinkling was to be stoned to death.
“Pleading the blood of Jesus” in prayer is a teaching common in Pentecostal andCharismatic circles. When people speak of “pleading the blood of Jesus in prayer,” they are referring to the practice of claiming the power of Christ over any and every problem by using the phrase “I plead the blood of Jesus over _______.” People fill in the blank with whatever they want: “I plead the blood of Jesus over my family/job/thoughts/illness.”“Pleading the blood of Jesus” has no clear basis in Scripture. No one in the Bible ever “pleads the blood” of Christ. Those who “plead the blood” often do so as if there were something magical in those words or as if by using them their prayer is somehow more powerful. This teaching is born from a misguided view of prayer that prayer is a way of manipulating God to get what we want rather than praying for His will to be done. The whole Word of Faith movement, which teaches pleading the blood, is founded on the false teaching that faith is a force and that, if we pray with enough faith, God guarantees us health, wealth, and happiness.
Those who teach the value of pleading the blood of Jesus usually point to the Passover as support of their practice. (It is quite common for Pentecostalism to base its doctrines on Old Testament examples.) Just as the blood of the Paschal lamb protected the Israelites from the angel of death and led to their deliverance from slavery, so the blood of Jesus can protect and deliver Christians today, if they apply, or “plead,” it.
Those who plead the blood of Jesus often do so in the context of seeking victory over demons. Pleading the blood of Jesus is a way of taking up the authority of Christ over the spirit world and announcing to the forces of darkness that they are powerless. Some base this aspect of pleading the blood on Revelation 12:11, “They triumphed over [Satan] by the blood of the Lamb and by the word of their testimony.”
The Scriptures you are asking about are Revelation 2:7, 11, 17, 26; 3:5, 12, 21; and 21:7. Many preachers, radio and television evangelists, and Christian writers utterly misunderstand and misapply these verses to support a false doctrine of works salvation or at least lessen the full scope of Christ's atonement.
Overcoming
Look at John 16:33 again: "I have told you these things, that in me you may have peace. In the world you have oppression; but cheer up! I have overcome the world." Pack's statement above, "Just as He qualified to replace Satan, so must we!" was in response to this Scripture. Did Jesus tell us we could have peace in Him and cheer up because He has overcome the world for us, or are His words only an empty pep talk? Did Jesus overcome the world only for Himself, and now we must accomplish this feat, too? Can we really expect to do something simply because Jesus has done it? I don't know about you, but I don't think I can fast forty days and forty nights. And I know that I can't die on a cross bearing other people's sins. So, why should I expect to overcome the world? Jesus had power that I as a weak human don't have.
