Why did justice Marshall rule the supreme court that could not issue the writ Marbury requested?

Justice Marshall ruled that the Supreme Court could not issue the writ requested by Marbury because the provision of the Judiciary Act of 1789 that granted the Court the authority to do so was unconstitutional. He determined that the Constitution did not grant the Supreme Court the power to issue writs of mandamus in this context, thereby establishing the principle of judicial review. This ruling reinforced the idea that the Constitution is the supreme law of the land, and it set a precedent for the Court's role in interpreting the law.