A march is to be held with the goal of the marchers being the residence of President Mohammed Morsi in Cairo.
Among the demands of the opposition: the resignation of the country's leadership, the abolition of the new constitution and the dissolution of the parliament's upper house.
The National Salvation Front issued a statement regarding the protest a few hours after the signing of a document called “non-Violence” at the Muslim University, Al-Azhar, by major political parties.
They are to be joined by leading Islamist movements including The Muslim Brotherhood and the Salafist party An-Nur.
Unrest across Egypt has not subsided since last Friday.
At least 60 people have been killed and hundreds have been injured in clashes.
0Voice of Russia, RIA, TASS