Question: What about the popular idea that we must "plead the blood" over a situation or one's home, room by room?
Response: The phrase "plead the blood" does not appear once in all of Scripture. The word "plead" is found 30 times but never in association with blood. Just before each meeting of the discredited "revival" at the Brownsville Assembly of God in Pensacola, Florida, teams would pray over each seat and "bind the demons" that might be lurking in them.
This is an unbiblical practice. The Bible contains no record of its ever being used by any apostle, prophet, or any other believer. Paul and the other apostles preached in many demonic places without once reciting this mantra. It is a vain practice that opens the door to much error, fanaticism, and spiritual bondage, needlessly giving attention to Satan and demons. Do not engage in it.