John Gill 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 straightway in the morning
As soon as it was break of day, or daylight appeared:

the chief priests held a consultation with the elders and Scribes ;
who were the principal men in the sanhedrim:

and the whole council ;
which, on this extraordinary occasion, was convened; the result of which was, to bind Jesus, and deliver him up to the Roman governor, to be put to death by him, as a seditious person, and an enemy to Caesar, and accordingly they did so:

and bound Jesus, and carried him away, and delivered him to Pilate .
The Syriac and Persic versions add, "the governor"; (See Gill on Matthew 27:1), (See Gill on Matthew 27:2).