Yale University's Avalon Project has a copy of the Hamas Covenant 1988 in their archives. The following is a direct quote. I encourage all readers to read the entire Covenant and to form your own opinion based on your personal interpretation of the document.
Source: Hamas Covenant 1988, The Avalon Project
Documents in Law, History and Diplomacy
Yale Law School, Lillian Goldman Law Library
Article Seven:
The Prophet, Allah bless him and grant him salvation, has said:
"The Day of Judgement will not come about until Moslems fight the Jews (killing the Jews), when the Jew will hide behind stones and trees.
The stones and trees will say O Moslems, O Abdulla, there is a Jew behind me, come and kill him.
Only the Gharkad tree, (evidently a certain kind of tree) would not do that because it is one of the trees of the Jews."
(related by al-Bukhari and Moslem).
Source: Hamas Covenant 1988, The Avalon Project
Documents in Law, History and Diplomacy
Yale Law School, Lillian Goldman Law Library