You have sent to John, and he has testified to the truth.
Ye have sent unto John ... refers to the deputation (John 1:19) sent out by the priests and to the positive witness of Christ which was borne by the great herald (John 1:19-35; 3:23-36).  The hierarchy should have believed John's witness: (1) that Jesus is the Christ; (2) that Jesus is the Messiah; (3) that Jesus is the Bridegroom; and (4) that Jesus is the Lamb of God that taketh away the sin of the world.  Also John declared that "He that believeth on the Son hath eternal life; but he that obeyeth not the Son shall not see life, but the wrath of God abideth on him" (John 3:36). This passing reference to John's witness, however, is parenthetical.