"Our weapons will remain in our hands and there are no conditions regarding Hamas's right to [continue] the resistance."
Hamas says it has accepted an Egyptian proposal to end the dispute with Fatah.
Officials set up a fund to make payments to families that lost their sons in the internecine Palestinian conflict in 2007, in return for publicly renouncing the demand to avenge their deaths.
Palestinian Authority President Mahmoud Abbas called for local groups to disarm, saying that they hurt the push for a unified Palestinian state.
Most analysts contend that Hamas will not lay down its arms, as called for by PA President Mahmoud Abbas as a precondition for assuming control over the enclave.
The burgeoning truce with the PA is Hamas's admission that when it came to governing it had no idea what to do.
Hamdallah: “I urge everyone without exception to embrace the leadership, reconciliation and national unity and to put our national interest above factional and party considerations and interests.”
Hamas opted for reconciliation with Western-backed Palestinian Authority President Mahmoud Abbas's Fatah because it is short of funds and friends.
The statement omitted any reference to Israeli settlement activity – a rarity for the Quartet.