When they had heard the king, they departed; and, lo, the star, which they saw in the east, went before them, till it came and stood over where the young child was.
All Commentaries on Matthew 2:9 Go To Matthew 2
John Chrysostom
AD 407
This passage shews, that when the star had brought the Magi nearly to Jerusalem, it was hidden from them, and so they were compelled to ask in Jerusalem, "where Christ should be born?” and thus to manifest Him to them; on two accounts, first, to put to confusion the Jews, inasmuch as the Gentiles instructed only by sight of a star sought Christ through strange lands, while the Jews who had read the Prophets from their youth did not receive Him, though born in their country. Secondly, that the Priests, when asked where Christ should be born, might answer to their now condemnation, and while they instructed Herod, they were themselves ignorant of Him. "The star went before them,” to show them the greatness of the King.
What wonder that a divine star should minister to the Sun of righteousness about to rise. It stood over the Child’s head, as it were, saying, ‘This is He; 'proving by its place what it had no voice to utter.