Numbers 5:2
Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by the dead: Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by the dead:
The command reflects the law that treated a leper as unclean and required him to be kept apart from the people, with touching him also making a person unclean. Those made unclean by such causes had to remain outside the camp until evening and cleanse themselves and their clothing before returning. Even slight impurity brought this exclusion, with washing required before return.
The surrounding land also had to be kept free of impurity, so that God would not see uncleanness in the camp. Despite this law of separation, Jesus touched the leper without fear and healed him. The command still teaches that God requires cleanliness, and that neglecting it can lead to disease.
The same rule shows that the filth of tobacco would have made a user unfit to mingle with the congregation until cleansed. God does not acknowledge an untidy and unclean person as a Christian, so lack of cleanliness among Sabbathkeepers must meet with open rebuke, and those who profess the truth but do not immediately change in these things must be put out of the camp. Corrupting error is an accursed thing that must be put out of the camp or Israel will be sickly, and views such as the age-to-come and the spiritual union views of spiritual wifery that lead to the worst kind of spiritualism cause loss of the power of the third angel's message.
Those who confess, give up the age-to-come, and keep all minds on the third angel's message are restored, but one who will not break down and give up spiritual union views must have all fellowship withdrawn until he gives them up and gets right. All in the camp who do not partake of the spirit of Jesus, who lack vital godliness, and whose hearts are not sanctified by the truth they profess will be purged out unless they soon change, so that God's people rise never to fall again with unfruitful branches cut off and others raised up in their place to bear fruit to the glory of God. That purging requires keeping close to Jesus with fasting and prayer for victory over the power of darkness, and it means the church must disfellowship the stubborn and rebellious who wound and tear the hearts of God's people and remain a dead weight to the church unless their course is entirely changed.