Al-Haya was speaking at a ceremony held in the central Gaza Strip to honor the families of those killed in Israel's December 2008 attack on the coastal enclave.
Israeli threats to carry out a new offensive on Gaza do not scare Palestinians, the official said, adding that the resistance would confront any attack with all available means.
Rhetoric from Israeli and Palestinian officials has sparked fears a recent escalation in violence could lead to a new war.
Regarding captured Israeli soldier Gilad Shalit, Al-Haya said he would not be released without a prisoner swap deal to free Palestinian prisoners.
Shalit was captured in a cross-border raid by Palestinian fighters in 2006. Hamas has been attempting to negotiate a deal in which 900 Palestinians are expected to be released in exchanged for the soldier's freedom. The talks have been suspended for the past several months.
Finally, the Hamas leader said the world was conspiring to link rebuilding Gaza with forcing Hamas to compromise its principles, a tactic the official denounced.
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