The following is based on islamic sources (quran and authentic traditions of prophet, based on a very detailed science of authenticating reports) and also on experience of muslim exhorsists. (crunchydomesticgoddess.com)
Many of the originators of communities have understood themselves as recovering authentic traditions from the past rather than as initiating something new. (religion-online.org)
One of the leading poets, Clemens von Brentano, encouraged the Grimms to collect popular narratives, and they did so in the belief that it was only in the people, the Volk, that genuine culture and authentic traditions resided. (firstthings.com)