A.T. Robertson Commentary Mark 11:27

"And they come again to Jerusalem: and as he was walking in the temple, there come to him the chief priests, and the scribes, and the elders;" — Mark 11:27 (ASV)

The chief priests, and the scribes, and the elders (ο αρχιερεις κα ο γραμματεις κα ο πρεσβυτερο). Note the article with each separate group as in Lu 20:1 and Mt 21:23. These three classes were in the Sanhedrin. Clearly a large committee of the Sanhedrin including both Sadducees and Pharisees here confront Jesus in a formal attack upon his authority for cleansing the temple and teaching in it.