They said therefore to him, "What then do you do for a sign, that we may see, and believe you? What work do you do?
      First,  He here  assures  us  that  this shall be done:  All that the Father giveth me shall come to me,  ; John 6:37. Christ had complained (John 6:36) of those who, though they had  seen  him, yet would not believe on him; and then he adds this,