Histories
Herodotus
Herodotus. Godley, Alfred Denis, translator. Cambridge, MA; London: Harvard University Press; William Heinemann, Ltd., 1920-1925 (printing).
They agree in this with practices called Orphic and Bacchic, but in fact Egyptian and Pythagorean: for it is impious, too, for one partaking of these rites to be buried in woolen wrappings. There is a sacred legend about this.