John Gill Commentary Mark 7:1

"And there are gathered together unto him the Pharisees, and certain of the scribes, who had come from Jerusalem," — Mark 7:1 (ASV)

Then came together unto him the Pharisees
Having heard of his miracles, and that he was come into the land of Gennesaret; they consulted with one another, and came together to Jesus, to watch and observe what was said and done by him, and take what advantage they could against him. These were not of that country, but were of Jerusalem, as were their companions the Scribes:

and certain of the Scribes, which were of Jerusalem ;
for the fame of Christ had reached the metropolis of the nation; and these men being the more artful and cunning of the whole sect, either came of themselves, or were sent by the sanhedrim, to make their observations upon his doctrine and conduct; (See Gill on Matthew 15:1).