Three times in the Gospels we find Jesus making mention of “binding the strong man.” In none of those three cases, however, did He tell His followers that “binding the strong man” was something they should practice. Let’s examine exactly what Jesus did say, and let’s read what He said contextually:
And the scribes who came down from Jerusalem were saying, “He is possessed by Beelzebul,” and “He casts out the demons by the ruler of the demons.” And He called them to Himself and began speaking to them in parables, “How can Satan cast out Satan? And if a kingdom is divided against itself, that kingdom cannot stand. And if a house is divided against itself, that house will not be able to stand. And if Satan has risen up against himself and is divided, he cannot stand, but he is finished! But no one can enter the strong man’s house and plunder his property unless he first binds the strong man, and then he will plunder his house. Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter; but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin”—because they were saying, “He has an unclean spirit” (Mark 3:23-30, emphasis added).
Notice that Jesus was not teaching His followers to bind any strong men. Rather, He was responding to the criticism of the Jerusalem scribes with unassailable logic and a clear metaphor.
They accused Him of casting out demons by using demonic power. He responded by saying that Satan would be insane to work against himself. No one can intelligently argue with that.
If it wasn’t Satan’s power that Jesus used to cast out demons, then whose power was He using? It had to be a power stronger than Satan’s. It had to be God’s power, the power of the Holy Spirit. Thus Jesus spoke metaphorically of Satan, comparing him to a strong man guarding his possessions. The only one able to take the strong man’s possessions would be someone even stronger, namely, Himself. This was the true explanation as to how He cast out demons.
This passage that mentions the strong man, as well as the similar ones found in Matthew and Luke, cannot be used to justify our “binding strong men” over cities. Additionally, when we examine the rest of the New Testament, we do not find any examples of anyone “binding strong men” over cities, or any instruction for anyone to do so. We can thus safely conclude that it is unscriptural for any Christian to attempt to bind and render powerless some supposed “strong man-evil spirit” over a city or geographic area.