The Lebanese group made the remarks in a statement on Tuesday.
The statement came shortly after an Israeli drone attack against a southern Beirut suburb led to the martyrdom of six people, including al-Arouri, who used to serve as the deputy head of the Political Bureau of the Gaza Strip-based Palestinian Resistance movement of Hamas.
"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 forces at the highest level of readiness and preparedness," Hezbollah asserted.
The movement described al-Arouri's assassination as a "dangerous attack" on the Lebanese sovereignty, and a "dangerous development" in the course of the war between the Israeli enemy and the regional Axis of Resistance.
The "heinous crime," Hezbollah added, will only increase the regional resistance forces' faith and boost their resolve to keep on their path "until victory and liberation" from Israeli occupation and aggression.
MP/PressTV