Possible Clues:

• Spies returning to a sign language
• Fine condiment originally taken with a sheep's tongue
• Using some upsetting rhetoric, I am a ranter in mostly obsolete language
• 'Cara mia' translated into another language
• Germany and Thailand have abandoned a theatrical old language
• Probable language of Jesus
• Jesus's words, say, in article member of flock spies written the wrong way
• A sheepish type spies review in a manner of speaking
• Common language of the 5th-century BC Persian empire
• The language spoken by Jesus Christ