25Then said some of them of Jerusalem, Is not this He, whom they seek to kill?
26But, lo, He speaketh boldly, and they say nothing unto Him. Do the rulers know indeed that this is the very Christ?
27Howbeit we know this man whence He is: but when Christ cometh, no man knoweth whence He is.
28Then cried Jesus in the temple as He taught, saying, Ye both know Me, and ye know whence I am: and I am not come of Myself, but He that sent Me is true, whom ye know not.
29But I know Him: for I am from Him, and He hath sent Me.
30Then they sought to take Him: but no man laid hands on Him, because His hour was not yet come.
31And many of the people believed on Him, and said, When Christ cometh, will He do more miracles than these which this man hath done?
Earlier (verse 12), some who came from elsewhere denied anyone sought to kill Jesus, but now the locals knew it was true.
Jesus spoke openly, but the rulers did nothing. Had the rulers decided Jesus was the Christ? (verse 26) In Greek, the question expects "no" for an answer.
They said He couldn't be Christ because they knew He came from Nazareth.
No man knoweth whence He is (verse 27) — Jesus responds, not with where He was from, but with whom He was from. Also, it was prophecied that the Messiah would come from Bethlehem. That's now what they probably meant. The probably referred to the virgin birth (Isaiah 7:14).
cried (verse 28) = spoke in a loud voice. (Isaiah 42:2 speaks of His general character — He will not cry out, nor raise His voice, nor cause His voice to be heard in the street.)
They knew some facts about Him, but not of His virgin birth or deity.
I am from Him (verse 29) — a proclamation of deity. Then they were ready to kill Him. They couldn't touch Him — proof that, when His hour came, He laid down His life.
Many believed (verse 31) — that He was Messiah, but not for salvation. They waited to see if He would perform more miracles.