Sheikh Saleh Al-Arouri was the Deputy Head of the Political Bureau of Hamas.
Hezbollah statement in response:
We consider the assassination of Sheikh Saleh Al-Arouri and his martyred companions in the heart of the southern suburb of Beirut a dangerous attack on Lebanon, its people, its security, its sovereignty, and its resistance. It carries deeply significant political and security messages and implications, and is a dangerous development in the course of the war between the enemy and the Axis of Resistance.
We in Hezbollah affirm that this crime will undoubtedly not go unanswered and unpunished. Our resistance remains firm, proud, and faithful to its principles and commitments that it has made to itself, ready with its hand on the trigger and its fighters at the highest level of readiness and preparedness.
They already tried once, it didn't go well and hezbollah has only gotten stronger and more organized.