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.

The illustration in this place is simply that of trying to patch an old garment with a piece of new, that is, unshrunken, cloth which, if attempted, would prove unavailing as soon as the garment was washed. The shrinkage of the new piece would tear itself out and the rent be made worse. The application is that Jesus did not come to apply Christianity as a new patch upon the old garment of Judaism. Christianity was not designed as an addition to Judaism, not as a patch upon an old system, but as an excitingly new and different religion altogether.