"David Margoliouth warned us not to be too credulous about the authenticity of so-called pre-Islamic poetry. Two of his principal arguments were the probity, or rather the lack of probity, of the earliest compilers and editors of pre-Islamic poetry, and the fact that many putative pre-Islamic poems contained words, phrases, and religious concepts derived from the Koran, even though the authors had died long before the Koran can have been said to exist."