Charles Ellicott Commentary Mark 15:1

"And straightway in the morning the chief priests with the elders and scribes, and the whole council, held a consultation, and bound Jesus, and carried him away, and delivered him up to Pilate." — Mark 15:1 (ASV)

And the whole council.—The words in the Greek are in apposition with “the chief priests.” We do not know of any other elements in the Council or Sanhedrin than the priests, scribes, and elders, and it is possible that the writer may have added the words in the sense of “even the whole Council,” as giving the collective word for the body whose three constituent parts had already been named. On the whole section see Notes on Matthew 27:1-2; Matthew 27:11–23.