John Gill Commentary Mark 11:18

"And the chief priests and the scribes heard it, and sought how they might destroy him: for they feared him, for all the multitude was astonished at his teaching." — Mark 11:18 (ASV)

And the Scribes and chief priests heard it
The reproof he gave to the money changers, and buyers, and sellers in the temple; and his strict prohibition that none should carry any vessels through it; and the argument he used from the prophecy of Isaiah, and the sharp rebuke he gave for the profanation of the holy place:

and sought how they might destroy him :
they took counsel together to take away his life, for they hated reformation:

for they feared him ;
lest he should go on to make great changes and alterations among them, which would affect their credit and character, and their gains also, and draw the people after him:

because all the people were astonished at his doctrine ;
both as to the matter of it, which were such words as never man spoke; and, as to the manner of it, being with such majesty, power, and authority, as the Scribes and Pharisees taught not with; and also at the miracles, by which it was confirmed, as well as at the reformation and discipline he was introducing; which was done with such an air of sovereignty and power, as was amazing.