Mateus 18

15 'And if your brother may sin against you, go and show him his fault between you and him alone, if he may hear you, you did gain your brother;

16 and if he may not hear, take with you yet one or two, that by the mouth of two witnesses or three every word may stand.

17 'And if he may not hear them, sayit to the assembly, and if also the assembly he may not hear, let him be to you as the heathen man and the tax-gatherer.