A variety of sources are stating that in a memoir Amin al-Husseini, once the Mufti of Jerusalem, wrote:
Our fundamental condition for cooperating with Germany was a free hand to eradicate every last Jew from Palestine and the Arab world. I asked Hitler for an explicit undertaking to allow us to solve the Jewish problem in a manner befitting our national and racial aspirations and according to the scientific methods innovated by Germany in the handling of its Jews. The answer I got was: 'the Jews are yours.'
For example:
ANOTHER TACK: Fiendish hypocrisy II, Sarah Honig, Jerusalem Post April 2001
Historical Dictionary of the Holocaust
The Gramsci Factor: 59 Socialists in Congress
However, I don't know of any primary source.
Is this an accurate quotation of Amin al-Husseini's journal or memoir?