Mahmoud al Zahar issued a statement calling on all Hamas leaders based abroad -- mainly in Syria -- to return to the Gaza Strip after Israel implements its disengagement plan.
Israel is expected to evacuate all Gaza Strip settlements and four others in northern West Bank and withdraw its troops by mid-August.
Al Zahar, however, added Hamas "would never give up armed resistance, or to hand over its militants' arms.
"The Palestinian Authority knows very well that such a thing would never happen," he said.
2014: The Year in Music [PHOTOS]