The historic ceremony took place amid tight security before the Supreme Constitutional Court and was overseen by Egypt’s military rulers who have been in control of the country since Hosni Mubarak was ousted last year during a popular revolution.
Morsi’s speech appeared aimed at Egypt’s ruling military council, whose recent actions have raised concerns about whether it would fully hand over control to an elected government.
Egypt’s electoral commission declared Morsi the president-elect Sunday after a runoff with Ahmed Shafik, a former air force general who served as Mubarak’s last prime minister.
Morsi had been the candidate of the Muslim Brotherhood’s Freedom and Justice Party, but he resigned from the party shortly after he was elected president.
Just days before the election, a high court ruled that Egypt’s parliament was unconstitutional.
Morsi’s supporters are pushing for a confrontation with the generals, who following the court ruling ordered the Islamist-dominated parliament dissolved and announced they would retain legislative power for an indefinite time.
Additionally, the military rulers named a defence council to oversee national security and foreign policies while also declaring it would maintain control of all military affairs.