Sylvester, in his translation of Du Bartas, gives this instead
of caw, caw, as the cry of the raven.
Sir Thomas Browne says that the Jews abstain from pork not from
fear of leprosy, as Tacitus alleges, but because the swine is an emblem
of impurity. (Vulgar Errors.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894