The trial of ousted president Mohamed Morsi and 35 others on charges of espionage was adjourned by a Cairo court on Saturday to 29 September.
Morsi, along with other leading figures of the Muslim Brotherhood including its Supreme Guide Mohamed Badie, is accused of collaborating with foreign organisations -- namely Gaza rulers Hamas, an ideological offshoot of the Brotherhood -- to commit acts of terrorism in Egypt.
The Cairo criminal court is expected to hear more witnesses, including police officials, in the upcoming session.
Morsi is also under investigation on separate charges of espionage for Qatar.
On 6 September, prosecutors referred Morsi and nine others to trial on charges of spying for the Gulf state.
The defendants are accused of leaking important national security documents to Qatari intelligence through the Qatar-based Al Jazeera news channel.
Morsi, who was deposed by the military in July 2013 amid mass protests against his rule, faces a number of other charges in separate cases, including incitement to murder and breaking out of prison in 2011.