Ayatollah Ruhollah Khomeini, on August 7, 1979, he declared the last Friday of the Holy month of Ramadhan each year as Quds Day, in which Muslims worldwide would unite in solidarity against Israel and in support of the Palestinians. Imam Khomeini declared the liberation of Jerusalem a religious duty to all Muslims. That day, he stated:
I invite Muslims all over the globe to consecrate the last Friday of the holy month of Ramadhan as Al-Quds Day and to proclaim the international solidarity of Muslims in support of the legitimate rights of the Muslim people of Palestine. For many years, I have been notifying the Muslims of the danger posed by the usurper Israel which today has intensified its savage attacks against the Palestinian brothers and sisters, and which, in the south of Lebanon in particular, is continually bombing Palestinian homes in the hope of crushing the Palestinian struggle. I ask all the Muslims of the world and the Muslim governments to join together to sever the hand of this usurper and its supporters. I call on all the Muslims of the world to select as Al-Quds Day the last Friday in the holy month of Ramadhan — which is itself a determining period and can also be the determiner of the Palestinian people’s fate — and through a ceremony demonstrating the solidarity of Muslims world-wide, announce their support for the legitimate rights of the Muslim people. I ask God Almighty for the victory of the Muslims over the infidels.