Security sources said the rockets landed on the villages of Nabi Othman and Labweh on Friday but left no casualties.
The so-called Islamic State of Iraq and the Levant (ISIL) operating against the Syrian government claimed responsibility for the attack.
On April 2, rockets also targeted Labweh, killing a Syrian national and wounded a resident of the village.
The Shia-populated region of Bekaa Valley has been targeted by rockets fired by anti-Syria militants over the past few months.
Lebanon has been rocked by the spillover of the conflict in Syria, with its north being the epicenter of fierce clashes between supporters and opponents of the Syrian government.
Syria has been gripped by crisis since March 2011. Damascus says the West and its regional allies have been fuelling the turmoil by providing militants with money and weapons.
Some reports suggest that Qatar, Saudi Arabia and Turkey are supporting the armed insurgents operating inside Syria.
According to some reports, an estimated 150,000 people have been killed due to the foreign-hatched unrest in Syria and a total of 7.8 million others have been displaced.
NTJ/MB