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Shakespeare's Merchant of Venice.

Shylock demands a literal pound of flesh as security when the merchant Antonio comes to borrow money for a friend. At Venice, Antonio's ships are reported lost at sea. This leaves him unable to satisfy the bond. As the court grants Shylock his bond and Antonio prepares for Shylock's knife, Portia deftly appropriates Shylock's argument for 'specific performance', and points out that the contract only allows Shylock to remove the flesh, not the "blood", of Antonio.

Shylock: Most learned judge, a sentence! Come prepare!

Portia: Tarry a little, there is something else. This bond doth give thee here no jot of blood; The words expressly are "a pound of flesh."