A.T. Robertson Commentary Matthew 9:16

"And no man putteth a piece of undressed cloth upon an old garment; for that which should fill it up taketh from the garment, and a worse rent is made." — Matthew 9:16 (ASV)

Undressed cloth (ρακους αγναφου). An unfulled, raw piece of woollen cloth that will shrink when wet and tear a bigger hole than ever.

A worse rent (χειρον σχισμα). Our word "schism." The " patch " (πληρωμα, filling up) thus does more harm than good.