“A man that is an heretick after the first and second admonition reject;”
King James Version (KJV)
3:10 An heretic (after a first and second admonition) reject - Avoid, leave to himself. This is the only place, in the whole scripture, where this word heretic occurs; and here it evidently means, a man that obstinately persists in contending about foolish questions, and thereby occasions strife and animosities, schisms and parties in the church. This, and this alone, is an heretic in the scripture sense; and his punishment likewise is here fixed. Shun, avoid him, leave him to himself. As for the Popish sense, A man that errs in fundamentals, although it crept, with many other things, early into the church, yet it has no shadow of foundation either in the Old or New Testament.
Tit 3:10 An heretic. A divider, or schismatic. Any one who preaches doctrines which divide the household of faith is a heretic. So is any schismatic or factious man. This is the only passage in the New Testament where "heretic" occurs, though "heresy" is elsewhere named (Ac 24:14). Reject. First admonish and warn, repeat it, and if there is no change, then refuse his fellowship.