Titus 3:10, "Warn a divisive person once, and then warn him a second time. After that, have nothing to do with him.”

Interesting points:
1. In this verse, Paul builds on the previous verse about avoiding of bickering, arguing, or squabbling with instruction on how to handle people who insist on stirring up division. Titus is to warn them twice before having nothing to do with them. This is similar to the instruction Jesus provided in correcting others in Matthew 18:15–17.

2. Note that Paul wants to ensure that false teachers, agitators, and people that sow divisiveness should not be given a platform in the church. As verse 11 will explain, their own conduct condemns them. Paul instructs Titus not to have any association with those who try to cause divisions within the church.

3. As the early Christian church grew, problems with false teachers grew as well. Several other New Testament writings and writers will address the recurring problem of false teachers, warning believers to stay away from them. Second John 1:10–11 adds an additional measure: those who insist on rejecting sound doctrine should not be supported in any way whatsoever. In Jude 1:4, indicates that divisive people can infiltrate churches unnoticed, only to be found out later.

Application.
Brothers, we must know the Word and be on our guard: even today, false teachers and trouble-makers infiltrate congregations to cause problems within the Church. When they are identified, we should advise church leaders so they can carefully and courageously investigate, address and correct false teaching. If required, church leaders must make the decision of publicly removing such false teachers or divisive persons from the Church and have nothing to do with them.