"Today Zionism and terrorism are the manifestations of the evil and the ugliness and fighting this cruelty and oppression is the first priority of the Muslim world," Larijani said in his message on Saturday.
He also wished growing might and honor for the Muslim world, unity and brotherhood of all Muslims and annihilation of all enemies, an instance of which, he said, was displayed in the recent victory of the Palestinians in the Gaza war against Israel.
Almost three million Muslims have gathered in the desert of Mena near the holy city of Mecca to mark Eid al-Adha on Saturday. Muslims around the world celebrate three following days in honor of the occasion.
The day marks the peak of the Hajj pilgrimage, during which pilgrims sacrifice sheep and cattle.