"I want to stress that I promised and I'm still promising ... if the state reaches a time where it needs to get petroleum derivatives, especially gasoline and diesel, we will have to go to Iran to get gasoline and diesel in front of the Lebanese shores, even if it causes a problem," Nasrallah said in a televised speech.
Nasrallah said earlier in June Iran could supply fuel to Lebanon in local pounds, avoiding a foreign currency crunch, Reuters wrote.
For weeks worsening fuel shortages on the back of Lebanon's financial crisis have forced motorists to queue for hours for very little gasoline.
Earlier on Friday caretaker Prime Minister Hassan Diab approved a decision to import fuel at a weaker Lebanese pound to dollar exchange rate, in effect decreasing the subsidy on gasoline.
"All the administrative and logistical work to make such a step succeeded – bringing gasoline and diesel from Iran, getting it into Lebanon and distributing it to reach citizens – we completed all these in the past few days. So if we seriously reached what I have talked about, that is the inability of the Lebanese state or its giving up on bringing these petroleum derivatives, all we need is permission to move," Nasrallah said.
He added that this would not be done through the central bank in order to avoid U.S. sanctions aimed at blocking Iranian oil exports.
Lebanon's long fuel lines have caused squabbles amongst motorists where gunshots were fired in several incidents.
On Friday, Nasrallah warned of civil violence.
"In all honesty, if you shoot at each other at the gas stations, that doesn't solve the crisis. If someone has a goal in sabotaging Lebanon... we would be realizing his goal," he said.
"There is a large number of crises in Lebanon but we have the blessing of security and civil peace."