Luke 13:33

‘Nevertheless I must go on my way today and tomorrow and the day following, for it cannot be that a prophet perish out of Jerusalem.'

Yet although there is yet today and tomorrow, and then the next as well, He must use it to go on His way to Jerusalem. Time is short and He does not have time to waste on Herod. For when ‘the third day' comes He must be at Jerusalem so that He can die there. So until then Herod cannot touch Him.

‘Must (it is necessary).' Note the sense of the divine necessity. He knows that death awaits Him in Jerusalem and He is determined to be there in God's timing. There is no other place for Him to die in. It is Jerusalem that has sealed its own fate by its sinfulness and hypocrisy, and must bear the guilt of His death, as it had prophets before Him (Luke 11:51).