In a speech marking Ashura, Nasrallah said Hezbollah's response to any attack would dwarf the attacks from Gaza during the eight-day conflict between Israel and the Hamas rulers of the coastal strip.
"Israel, which was shaken by a handful of Fajr-5 rockets during eight days - how would it cope with thousands of rockets which would fall on Tel Aviv and other (cities)... if it attacked Lebanon?" he said in speech, relayed by video-link to tens of thousands of Shia faithful in central Beirut.
Hezbollah, which fought an inconclusive 34-day war with Israel in 2006, flew a drone over Israel last month, further escalating tensions in the region after Israel threatened to bomb the nuclear sites of Hezbollah's patron Iran.
Nasrallah said the rockets fired into Israel during the Gaza conflict had a range of between 40 to 70 km (25 to 45 miles), while Hezbollah could strike anywhere from Israel's northern border to its southern Red Sea port of Eilat.
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