Ultimately, Muslim scholars like Al-Biruni found little records left of the belief of for instance the Khawarizmians because figures like Qutayba ibn Muslim "extinguished and ruined in every possible way all those who knew how to write and read the Khawarizmi writing, who knew the history of the country and who studied their sciences." As a result, "these things are involved in so much obscurity that it is impossible to obtain an accurate knowledge of the history of the country since the time of Islam…"