The Old Testament lays the foundation of justification by substitutionary atonement: blood must be shed to atone for our souls. (Le 17:11) There’s never been any other way to take care of our sin problem: something or someone must take our place.
Yet it’s clear that animals are an insufficient sacrifice for human sin (He 10:4); a sacrifice of sufficient worth must be presented for our souls. Jesus Christ is that perfect sacrifice (Jn 1:29); God makes Christ to be sin for us that we might be made perfectly righteous in Him (2Co 5:21); His blood is what eternally justifies us before God, makes us perfectly righteous in His sight. (Ro 5:9) Nothing else even gets close, but God is perfectly satisfied with the sacrifice of Christ on our behalf. (Is 53:11) Jesus Christ: He is the propitiation for our sins, and not for ours only, but also for the sins of the whole world. (1Jn 2:2)
The blood of Christ not only secures our justification, redeeming us — buying us back to God after we sold ourselves into the slavery of sin — through Christ’s sacrificial atonement for us on the altar of God, forgiving all our sins (Ep 1:7), it’s also sprinkled upon us (1Pe 1:2), as animal blood was sprinkled upon Israel (He 9:19-21), to sanctify us (He 10:29) and set us apart from this world so we can safely draw near to Him. (He 10:22) His blood purges our consciences of dead works so we may serve God. (He 9:14) Christ thereby effects and secures our sanctification (1Co 1:30), which results in us having a practical testimony, a righteous message or word emanating from our lives, which proves out our justification. (Re 12:11b)
Christ shed His blood to atone for our souls, securing our justification and sanctification. Yet some would take it upon themselves to try and apply His blood upon their houses, pets, furniture and cars, or upon an atmosphere, or setting — as if this would deter evil spirits from being able to access material things or invade our living spaces. This treats the blood of Jesus as an amulet or a charm, like an incantation or a magic spell in reverse. Is this an appropriate application of the precious blood of the Son of God?
I see no instance in scripture of anyone using the blood of atonement and sanctification in this manner, and no indication that evil spirits might be afraid to come near the blood of Christ. The entire nature of spiritual warfare is based upon entirely different principles, which are totally unrelated to such techniques.
God never tells us to resist and overcome the devil by pleading the blood of Christ; He teaches us to resist and overcome the enemy by believing and acting in truth. (2Ti 2:25-26) To the degree that lies have a home in our minds and hearts we’re in bondage (Jn 8:32); lies lead to sin, and sin enslaves. (34)
Inevitably, one will claim that pleading the blood works in their experience: it produces the results they want. This may be true on occasion, but this doesn’t justify the technique. Witchcraft works. (Ac 8:11) Why wouldn’t the enemy entice with superficial results if he can deceive us into demeaning and abusing the blood of Christ?
Trust in such devices may indeed be just one more way the enemy gains ground to steal, kill and destroy. We must be very careful, staying true to scripture and walking in truth. In spiritual things, the ends do not justify the means.
The precious blood of Christ has secured our redemption (1Pe 1:18-19) and brought us near to God. (Ep 2:13) Let’s be exceedingly thankful for this priceless gift, and reverent and sober in how we treat it.