Naim Qassem, the second in command of Hezbollah, warned Israel it will get a "slap in the face" if it decides to escalate the conflict with the group.
"The enemy must know the party is ready, that we are preparing based on the principle that an endless aggression can happen, just like our will to push back the aggression is infinite," Qassem said in a statement.
Earlier, the Washington Post reported, citing unnamed Western officials, that Israel is preparing to escalate fighting with Hezbollah on the Israel-Lebanon border at the end of January.