Hezbollah, the Lebanese Shia armed group, is playing an increasingly significant role in Syria's civil war.
Some support the group's defence of Bashar al-Assad, the Syrian president, but others say it has destabilised Lebanon.
The Syrian opposition said thousands of Hezbollah men are in Syria defending the Assad regime.
And many argue that Hezbollah's decision to fight alongside the Syrian government has caused opposition groups to target Shia neighbourhoods in Lebanon with car bombs.
Al Jazeera's Rula Amin travelled to a mainly Shia village, where many men have left to fight in Syria.