speak evil of

References in classic literature ?
O whoreson scoundrel, how ungrateful you are, you see yourself raised from the dust of the earth to be a titled lord, and the return you make for so great a benefit is to speak evil of her who has conferred it upon you
Those who have the least will have the best chance to flourish in an environment free from daily assault by employers and occupying forces, neighbors and those who speak evil of them.