Matteo 2:3

When Herod the king had heard these things, he was troubled, and all Jerusalem with him.

The consternation of Herod may be explained in two ways. As king, because of his position as king, Herod was troubled. Having himself reached his position of ruling sovereign by methods which were not at all unobjectionable, the foreigner and usurper feared a rival, and the tyrant feared the joyful acceptance of the rival by the people. At the same time, Herod felt a dread since it was freely predicted that a great personage, the Messiah, the King of the Jews, should judge both the nation and the world, and Herod's conscience was not clean.

On the other hand, the people were excited for different reasons. Their alarm was due to a bad conscience and the feeling of guilt because of their hypocrisy and selfishness which was sure to be found out by the Messiah, but mingled with this was the excitement of expecting a deliverer from the yoke of Rome, a hope which had been carefully cherished by the Pharisees.