|Soon after landing in Lebanon Mr. Hariri prayed at the grave of his father, the former PM Rafik al-Hariri, who was assassinated in 2005|
Mr. Hariri was greeted at Beirut airport by members of the security forces as he disembarked from his plane.
He caused a political crisis and stunned many in his country when he quit during a visit to Riyadh.
Mr. Hariri denied speculation that Saudi Arabia had forced him to depart as part of a regional power struggle with Iran.
Lebanese President Michel Aoun has refused to accept his resignation until he presents it in person. The pair are due to meet later on Wednesday.