Possible Clues:

• One above criticism
• One immune from criticism
• Bad thing to criticize
• Untouchable one
• One immune to criticism
• Papal bull's counterpart that's beyond criticism
• Something bovine above criticism?
• It's above criticism, as counterpart of papal bull?
• Adage about credit company losing it, an institution held to be above criticism
• Hallowed bovine in India or revered institution