It surprised me when I read those words. They can be found in Luke 13:18-35.
1 At that very hour some Pharisees came and said to him, "Get away from here, for Herod wants to kill you."
32 And he said to them, "Go and tell that fox, 'Behold, I cast out demons and perform cures today and tomorrow, and the third day I finish my course.
The rest of the passage is rather sad though. With Jesus talking about how Jerusalem had such a bad reputation for killing the prophets of God. You can see that love the Jesus holds for them inspite of what they do. He would to gather them to him like a hen gathers in her chicks. But she won't let him, so therefore she is forsaken. Imagine... being forsaken by the Lord. This thing I would not want. ....
33 Nevertheless, I must go on my way today and tomorrow and the day following, for it cannot be that a prophet should perish away from Jerusalem.' 34 O Jerusalem, Jerusalem, the city that kills the prophets and stones those who are sent to it! How often would I have gathered your children together as a hen gathers her brood under her wings, and you would not! 35 Behold, your house is forsaken. And I tell you, you will not see me until you say, 'Blessed is he who comes in the name of the Lord!'"
37 As he was drawing near—already on the way down the Mount of Olives—the whole multitude of his disciples began to rejoice and praise God with a loud voice for all the mighty works that they had seen, 38 saying, “Blessed is the King who comes in the name of the Lord! Peace in heaven and glory in the highest!”