The Saudis have found that asserting leadership is one thing, winning it quite another.
Bahrain, Sudan and the UAE have already rallied behind Saudi Arabia against Iran.
Iranians will still be allowed to visit Saudi Arabia on pilgrimage, according to the Saudi foreign minister.
Execution of Sheikh Nimr al-Nimr draws Shi'ite anger across the region.
Saudi Arabia executed 47 people on Saturday including Shiite cleric Nimr al-Nimr.