Lebanese President Michel Aoun will not accept Hariri's resignation until he returns to Lebanon to explain his reasons, palace sources said on Sunday, delaying for now the politically hard consultations over his successor.
Lebanon's Shi'ite Hezbollah group on Sunday accused Saudi Arabia of forcing Lebanese Prime Minister Saad al-Hariri to quit, and called for calm in an effort to contain the political crisis unleashed by his resignation.
"The resignation was a Saudi decision dictated to Prime Minister Saad al-Hariri and was forced on him", Nasrallah said in a televised address.
Hariri, a protege of Riyadh, on Saturday announced his surprise resignation in a broadcast from the Saudi capital.
Riyadh considers Hezbollah, a close ally of Saudi regional rival Iran, to be a "terrorist" organisation.
"Do not listen to alarmist speeches", Nasrallah said.
CGTN's Yasser Hakim confirms Saudi intelligence convinced Hariri that his life could be in peril if he traveled back to Lebanon. The nation was without a cohesive government and leadership for almost two years.
Along with Iran and Syria, the Lebanese terror group was responsible for the 2005 assassination of Hariri's father, former prime minister Rafik Hariri, which the younger Hariri cited in his resignation speech.
According to the source, with their inappropriate demands, Hariri and the Saudis expected Iran to leave alone the Yemenis to their fate "but after receiving Iran's negative response, the Saudis called back Hariri and urged him to resign".
Under the power-sharing system that helped end Lebanon's 1975-1990 civil war, the president must be a Christian, the premier a Sunni and the speaker of parliament a Shiite.
Nasrallah questioned the timing of Hariri's announcement at a time when "things are proceeding normally.in the heart of government" in Lebanon.