And say unto him, by what authority dost thou do these
 things?
 &c.] Enter into the temple, as if he was Lord of it; and correct in such a magisterial way every thing he thought an abuse in it; do the miracles he did, as healing the lame, and blind; and take upon him to instruct the people, a work he was now engaged in: 
 and who gave thee this authority to do these things?
 (See Gill on Matthew 21:23).