Both sides called for Tenth of Ramadan demonstrations in the streets of the capital of Cairo. Ramadan's 10th day in October 1973 marked the beginning of a war with Israel that is remembered with pride in Egypt.
Supporters of Morsy, who is backed by the Muslim Brotherhood, announced a "Breaking the Coup" rally. Morsy's opponents called on people to turn out to support the new government and protest "against terrorism."
Dozens have been reported killed and thousands injured in protests since Morsy was forced out and arrested by the Egyptian military on July 3. Amid fears of widening violence, interim President Adly Mansour took a hard line Thursday in his first televised speech.
"We will battle to the end to bring security. We will maintain the revolution. The past will not return," vowed Mansour, a judge installed by the military pending a promised return to democracy.
The military issued its own warning to demonstrators "not to deviate from peaceful means of expression." The statement, released to the state-run al-Ahram Online news agency said, "Whoever does not abide peacefully is only exposing his life to danger and will be dealt with according to the law."
Human rights groups have accused the military of heavy-handed dealings with protesters, while others have blamed Morsy's supporters and opponents for inciting violence.
The U.S. Embassy in Cairo warned Americans to limit travel there during Friday's protests.
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