"Oh Muslim peoples, your countries have been entrusted to you, so safeguard your security and stability, your gains, your resources and public projects," Grand Mufti Sheikh Abdul Aziz al-Sheikh said in a televised address from Nimrah Mosque at Mount Arafat in western Saudi Arabia.
Close to two million Muslims from around the world were gathered there for a day of prayer at the peak of the annual Hajj.
"And know that you are targeted by your enemies who want to tear your ranks, turn your hearts against each other and spread chaos and confusion and beware of their conspiracies," he said from the spot where Prophet Mohammed (PBUH) made his final sermon 14 centuries ago.
In August, the mufti urged Muslim youth not to be influenced by "calls for jihad ... on perverted principles."
The mufti has said that radicalism and terrorism "have nothing to do with Islam and (their proponents) are the enemy number one of Islam".
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