A.T. Robertson Commentary Mark 14:43

"And straightway, while he yet spake, cometh Judas, one of the twelve, and with him a multitude with swords and staves, from the chief priests and the scribes and the elders." — Mark 14:43 (ASV)

And the scribes (κα των γραμματεων). Mark adds this item while Joh 18:3 mentions "Pharisees." It was evidently a committee of the Sanhedrin for Judas had made his bargain with the Sanhedrin (Matthew 26:3; Luke 22:2). See discussion of the betrayal and arrest on Mt 26:47-56 for details.