This is one reason, — It is not a proper time for them to fast. Another is, they are not ripe for it. New cloth — The words in the original properly signify cloth that hath not passed through the fuller's hands, and which is consequently much harsher than what has been washed and worn; and therefore yielding less than that, will tear away the edges to which it is sewed.
Related Commentaries of Matthew 9:16
Matthew 9:16
16 No man putteth a piece of newa cloth unto an old garment, for that which is put in to fill it up taketh from the garment, and the rent is made worse.