Known sourcecanonical
"From the poetry of Lord Byron they drew a system of ethics compounded of misanthropy and voluptuousness,--a system in which the two great commandments were to hate your neighbour and to love your neighbour's wife."
Thomas B. Macaulay / On Moore's Life of Lord Byron. 1830.
Bartlett's Familiar Quotations, 9th ed. (Little, Brown, 1905), public domain
Bartlett's Familiar Quotations, 9th ed. (Little, Brown, 1905), public domain