Casa Arabe is committed to being a meeting point between Spain and the Arab world
The official, speaking on condition of anonymity, said Israel "recognised these specific APCs... as those given by the US to Lebanon".
Israel shared the information with the United States "a few weeks ago", the official told reporters. He did not specify how many armoured personnel carriers were involved.
Hezbollah has been fighting alongside President Bashar Al Assad's forces in Syria's civil war.
The APCs were probably handed by the Lebanese army to Hezbollah as part "of a deal", the Israeli official said, asserting that the militant group had "tightened its grip" over central Lebanese institutions.
Images shared on social media in recent weeks showed Hezbollah staging a military parade in the Syrian town of Qusayr, which it retook from rebels in 2013 in its first major victory after it intervened in support of Assad's regime.
Photographs of tanks, armoured vehicles and anti-aircraft batteries displaying the movement's yellow flag could be seen.
Washington said last month that the United States would be "gravely concerned" if military equipment it supplied to the Lebanese army ended up in Hezbollah's hands.
Lebanon's armed forces denied that the vehicles in the pictures had belonged to it.
According to the Israeli official, Hezbollah has "about 8,000 people in Syria", estimating that 1,700 of its fighters have been killed there since the war began in 2011.
Watchtowers built by the Lebanese army on the Israeli border were also constructed according to Hezbollah instructions, with the country's military and Iran-backed Shiite militiamen conducting joint patrols, the Israeli official said.
Israel has sought to limit its involvement in the Syrian conflict, but has carried out sporadic sorties against Hezbollah inside Syria.
Israel says it reserves the right to stop the group acquiring sophisticated weapons from Syria and Iran and threatening the country from both its Lebanese base and positions in Syria.
Casa Arabe is committed to being a meeting point between Spain and the Arab world
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