Iraqi cleric Ahmed al-Safi, an aide of Grand Ayatollah Ali Sistani, speaks as he delivers the text of a sermon by Sistani during Friday prayers at the Imam Hussein shrine in the holy city of Kerbala August 15, 2014. Iraq's most influential cleric Sistani threw his weight behind the new prime minister and said the transition was a rare opportunity to resolve political and security crises. REUTERS/Mushtaq Muhammed (IRAQ - Tags: CIVIL UNREST POLITICS RELIGION)