Matthew 21 27
So they answered Jesus, “We don't know.” “Then I won't tell you by what authority I'm doing these things,” Jesus replied.
Compare with other 3 random translations
ERV Matthew 21:27So they told Jesus, “We don’t know the answer.” Jesus said, “Then I will not tell you who gave me the authority to do these things.
AMP Matthew 21:27So they answered Jesus, “We do not know.” And He said to them, “Neither will I tell you by what [kind of] authority I do these things.”Parable of Two Sons
YLT Matthew 21:27And answering Jesus they said, 'We have not known.' He said to them — he also — 'Neither do I tell you by what authority I do these things.