The Jerusalem Congress convened January 27 – February 10, 1919, under the leadership of Aref al-Dajani and Izzat Darwazah.

"[2] As chairman of the Jerusalem Congress, al-Dajani rejected political Zionism and agreed to accept British assistance on condition that it did not impinge on Arab sovereignty in Palestine.

If the League of Nations will not listen to the appeal of the Arabs this country will become a river of blood.”[4] In September 1920, al-Dajani became deputy president of a committee of notables established by the Pan-Islamic Movement.

In his opening speech, he read letters received from Turkey and India, and called for Pan-Islamic ideals to be embraced by Palestinian Muslims.

[6] Al-Dajani was branded a conspirator by E. Quigley, assistant director of Public Security during the British Mandate.