In Leviticus chapter 14 the Law prescribed a detailed way to handle mold growth in a house
The Lord said to Moses and Aaron, “When you enter the land of Canaan, which I am giving you as your possession, and I put a spreading mold in a house in that land, the owner of the house must go and tell the priest, ‘I have seen something that looks like a defiling mold in my house.’ The priest is to order the house to be emptied before he goes in to examine the mold, so that nothing in the house will be pronounced unclean. After this the priest is to go in and inspect the house. He is to examine the mold on the walls, and if it has greenish or reddish depressions that appear to be deeper than the surface of the wall, the priest shall go out the doorway of the house and close it up for seven days. On the seventh day the priest shall return to inspect the house. If the mold has spread on the walls, he is to order that the contaminated stones be torn out and thrown into an unclean place outside the town. Leviticus 14:33-40 –
If the mold spread and did not resolve, the stones that had mold were eventually to be torn out and “thrown into an unclean place” – yet what does this have to do with us as believers. We are told that in Christ we are “Living stones”
As you come to him, the living Stone —rejected by humans but chosen by God and precious to him— you also, like living stones, are being built into a spiritual house to be a holy priesthood, offering spiritual sacrifices acceptable to God through Jesus Christ.
1 Peter 2:4-5
The Old Testament in a literal sense shows how we ought to deal with sin in the spiritual sense. Paul later on says this
Get rid of the old yeast, so that you may be a new unleavened batch—as you really are. For Christ, our Passover lamb, has been sacrificed. Therefore let us keep the Festival, not with the old bread leavened with malice and wickedness, but with the unleavened bread of sincerity and truth.
1 Corinthians 5:7-8
In our lives we too can get contaminated areas of sin we have to remove, repent of and rip out of our lives. As long as we do not address a sin pattern, it will spread to other areas of our lives like invading mold.
Also, sin in the Body Of Christ/ Jesus and the Apostles taught how to address someone who was claiming to be a believer yet willfully sinning. Meaning, they were unwilling to repent and deal with sin.
Right after 1 Corinthians 5:7-8 where Paul refers to wickedness as yeast or leaven, he says: “I wrote to you in my letter not to associate with sexually immoral people— not at all meaning the people of this world who are immoral, or the greedy and swindlers, or idolaters. In that case you would have to leave this world. But now I am writing to you that you must not associate with anyone who claims to be a brother or sister but is sexually immoral or greedy, an idolater or slanderer, a drunkard or swindler. Do not even eat with such people. What business is it of mine to judge those outside the church? Are you not to judge those inside? God will judge those outside. “Expel the wicked person from among you.” (1 Corinthians 5:9-13)
Paul is not saying we need to go out in world to deal with sinning people or look for mold outside of God’s house but rather protect the integrity inside the walls of God’s house. Paul is saying, its our job to deal with people who claim to belong to Christ who are willfully sinning, not try to micromanage unbelievers.
In essence, “expel the wicked person from among you” – that is like tearing out an old molded stone that needs to go. Take notice, see how the priest was to give a set time to see if the mold spread? We too ought to address sin in the Body that way, remind the person or individual the truth and give them time to deal with it. There comes a point though were it becomes obvious the person is not willing and must be removed from fellowship.
Jesus taught, “15 “If your brother or sister sins, go and point out their fault, just between the two of you. If they listen to you, you have won them over. 16 But if they will not listen, take one or two others along, so that ‘every matter may be established by the testimony of two or three witnesses.’ 17 If they still refuse to listen, tell it to the church; and if they refuse to listen even to the church, treat them as you would a pagan or a tax collector. (Matthew 18:15-17)
The last resort was to “treat them as you would a pagan or a tax collector” – Meaning not poorly but regard them as if they were just not saved. In that case only God would fully truly know if they were truly a Christ follower or not but the evident behavior of that person would cast doubt as to whether they were.
The whole point was not to let someone who was living in willful defiance to God’s commands to be a part of fellowship in order to keep their ways and ideas from spreading further. When the body gets sick, one will vomit up whatever did not agree with their stomach. In many cases vomiting is the body’s way of refusing a toxic or unhealthy substance. Yet the same is true of the Body, some will slip in and by failure to deal with sin in their own lives they will spread that sickness.
It may seem harsh, yet if you look at the case of Achan in Joshua 7, his deliberate willful sin brought problems to Israel at large. Though the rest of the Israelites were ignorant and unaware of what Achan had done, The Lord said “until you remove the objects devoted to destruction I will not give you help against the enemy”
Achan had to be dealt with before the Israelites could have victory again. So too sin must be dealt with in our own lives as well as in the walls of the Church.