On April 11, 1996,
Atta signed his last will and testament at the mosque, officially declaring his Muslim beliefs and giving 18 instructions regarding his burial.[8][13] This was the day that Israel attacked Lebanon in Operation Grapes of Wrath, which outraged Atta. Signing the will, "offering his life" was Atta's response.[40] The instructions in his last will and testament reflect both
Sunni funeral practices, along with some more puritanical demands from
Wahhabism, including asking people not "to weep and cry" or show emotion. The will was signed by el-Motassadeq and a second individual at the mosque.[41]
Wahhabi (Arabic: Al-Wahhābīyya‎ الوهابية

or Wahhabism is a Sunni Islamic sect based on the teachings of Muhammad ibn Abd-al-Wahhab, an 18th century scholar from what is today known as Saudi Arabia, who advocated purging Islam of what he considered impurities.
Wahhabism is the dominant form of Islam in Saudi Arabia.[1] It is often referred to as a "sect"[1] or "branch"[2] of Islam, though its supporters and some opponents reject such appellations. It has developed considerable influence in the Muslim world in part through Saudi funding of mosques, schools and social programs.
According to Wahhabi documents cited by Freedom House's Center for Religious Freedom, "It is a religious obligation for Muslims to hate Christians and Jews." These documents, published by the government of Saudi Arabia, also condemn Shiite Muslims and democracy as a way of government [37].
Wahhabi - Wikipedia, the free encyclopedia