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As such, it is the principal guide for Muslims in interpreting the Koran and the source of the vast majority of Islamic law, or Sharia.

But the Turkish state has come to see the Hadith as having an often negative influence on a society it is in a hurry to modernise, and believes it responsible for obscuring the original values of Islam.

It says that a significant number of the sayings were never uttered by Muhammad, and even some that were need now to be reinterpreted.

'Reformation'

Commentators say the very theology of Islam is being reinterpreted in order to effect a radical renewal of the religion.

Its supporters say the spirit of logic and reason inherent in Islam at its foundation 1,400 years ago are being rediscovered. Some believe it could represent the beginning of a reformation in the religion.

Turkish officials have been reticent about the revision of the Hadith until now, aware of the controversy it is likely to cause among traditionalist Muslims, but they have spoken to the BBC about the project, and their ambitious aims for it.

The forensic examination of the Hadiths has taken place in Ankara University's School of Theology.

An adviser to the project, Felix Koerner, says some of the sayings - also known individually as "hadiths" - can be shown to have been invented hundreds of years after the Prophet Muhammad died, to serve the purposes of contemporary society.

"Unfortunately you can even justify through alleged hadiths, the Muslim - or pseudo-Muslim - practice of female genital mutilation," he says.

"You can find messages which say 'that is what the Prophet ordered us to do'. But you can show historically how they came into being, as influences from other cultures, that were then projected onto Islamic tradition."

The argument is that Islamic tradition has been gradually hijacked by various - often conservative - cultures, seeking to use the religion for various forms of social control.

Leaders of the Hadith project say successive generations have embellished the text, attributing their political aims to the Prophet Muhammad himself.

Revolutionary

Turkey is intent on sweeping away that "cultural baggage" and returning to a form of Islam it claims accords with its original values and those of the Prophet.