Now when He came into the temple, the chief priests and the elders of the people confronted Him as He was teaching, and said, “By what authority are You doing these things? And who gave You this authority?”
24 But Jesus answered and said to them, “I also will ask you one thing, which if you tell Me, I likewise will tell you by what authority I do these things: 25 The baptism of John—where was it from? From heaven or from men?”
And they reasoned among themselves, saying, “If we say, ‘From heaven,’ He will say to us, ‘Why then did you not believe him?’ 26 But if we say, ‘From men,’ we fear the multitude, for all count John as a prophet.” 27 So they answered Jesus and said, “We do not know.”
And He said to them, “Neither will I tell you by what authority I do these things.” – Matthew 21:23-27.
Jesus is in the temple where he is confronted by the chief priests and elders, who question His authority to do these things. He replies with a question as to whether the baptism of John is from heaven (namely from God) or from men. They reason that if they reply ‘from heaven’, their unbelief is exposed. If they reply ‘from men’, the crowd will be against them for they consider John as a prophet. So they lie, saying that they do not know, and Jesus says, in that case, He will not answer them either. It is quite clear where the authority of Jesus comes from!