Because He had said, “If he will not hear the Church, let him be to thee as a heathen, and a publican,” whereupon the brother so contemned might answer, or think within himself, If you despise me, I also will despise you; if you condemn me, you shall be condemned by my sentence. He therefore confers powers upon the Apostles, that they may be assured that when any are condemned after this manner, the sentence of man is ratified by the sentence of God. “Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven; and whatsoever ye shall loose upon the earth shall be loosed in heaven.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).