Warden Seixas’s letter immediately brought forth from Washington the now-famous response, undated but sent on August 21, 1790. As a number of commentators have remarked, it has sometimes been overlooked how good a politician George Washington could sometimes be. Picking right up on Seixas’s theme, and using some of Seixas’s own language, he noted that in the United States “[a]ll possess alike liberty of conscience and immunities of citizenship,” and that the government of the United States “gives to bigotry no sanction, to persecution no assistance.” These are the words for which the letter remains famous.
Source : Washington’s Legacy for American Jews: ‘To Bigotry No Sanction’
