The unfired rockets, which were mounted on launchers, were found in the town of Halta about 1 km from an Israeli military site on Mount Hermon.
They appeared to have put in the area since the offensive on Gaza began last week, the security sources said.
Lebanese soldiers surrounded the area around the intended launch site and cut off several nearby roads, according to a Reuters journalist in the area.
Today's bombing in Tel Aviv is reminiscent of six years ago and could mark a serious escalation in the conflict.
A truce in Gaza suits all sides but none of the groups seem interested in a long-lasting solution.
A complex system of air defences has been instrumental in protecting Israel's population from incoming rockets.