Mark 2:21

No man seweth a piece of undressed cloth on an old garment: else that which should fill it up taketh from it, the new from the old, and a worse rent is made.

Patching old clothes was a familiar thing to our Lord, suggesting his poverty that has made us rich. The force of this humble metaphor lies in the fact that: if a piece of new, unshrunk cloth is used to mend a hole in an old garment, then just as soon as the garment is washed, the new material will shrink, thus tearing out an even larger hole in the garment. The application of this means that Christ did not come to patch up Judaism with the new teachings of Christianity. His holy religion was not designed to mend old religions but was a gloriously new thing, bearing the same relationship to Judaism that a building has to the scaffolding that precedes it.