Three Lebanese were sentenced to death by a military court on Friday for spying for Israel, a judicial source said.
The tribunal "condemned to death Mussa Ali Mussa, who was found guilty of having contacted the Israeli enemy and passing on information," the source said.
The court found that Mussa had passed on to the Jewish state between 2000 and 2010 "information on officials from Hezbollah," the powerful Lebanese Shia group.
The court also condemned to death in absentia Ali Sweid and Ahmed Hussein Abdullah on charges of spying for Israel.
Lebanese authorities in 2009 launched a national crackdown on alleged Israeli espionage rings. Lebanon and Israel remain technically in a state of war and convicted spies can face the death penalty.
More than 100 people have been arrested on suspicion of collaborating with Israel's Mossad spy agency, including an army general, members of the security forces and telecoms employees.
Several people have so far been sentenced to death, including one found guilty of helping Israel during its devastating 2006 war with arch-enemy Hezbollah. However, none of the death sentences has yet been carried out.