John Gill Commentary Mark 11:29

"And Jesus said unto them, I will ask of you one question, and answer me, and I will tell you by what authority I do these things." — Mark 11:29 (ASV)

And Jesus answered and said unto them
Being not in the least intimidated by such a body of men:

I will also ask of you one question ;
or "one word", or "one thing"; (logov) , here answers to the Hebrew word (rbd) , which signifies both "word" and "thing":

and answer me, and I will tell you by what authority I do these
things; (See Gill on Matthew 21:24).