If He refuses … tell it to the church.Three steps for addressing sin are given here: first, it is private; then, with faithful witnesses, and finally, before the church. The offender is given the opportunity to correct himself privately before it is made public (Deut. 17:6; 19:15; 2 Cor. 13:1-2).
Let him be to you like a heathen.Rebellious believers who will not submit to church discipline are to be shunned by the church, so as to bring them to correction (1 Cor. 5:1-13; 6:1-8; 2 Thess. 3:11-15).