Source
Berlin, 1. September 1939
Reichsleiter Bouhler and Dr. Brandt, M.D. are charged with the responsibility of enlarging the authority of certain physicians to be designated by name in such a manner that persons who, according to human judgment, are incurable can, upon a most careful diagnosis of their condition of sickness, be accorded a mercy death.
[signed] A. Hitler
Source of English translation: Signed Letter by Hitler Authorizing Euthanasia Killings (backdated to September 1, 1939). In United States Chief Counsel for the Prosecution of Axis Criminality, Nazi Conspiracy and Aggression, Volume III. Washington, DC: United States Government Printing Office, 1946, Document 630-PS, p. 451. English translation credited to Nuremberg staff. Available online at: https://www.loc.gov/item/2011525363_NT_Nazi_Vol-III/
Source of original German document: Auftrag Hitlers an Reichsleiter Bouhler und Dr. Brandt: Bestimmte Ärtzte sind zu ermächtigen, den Gnadentod an Unheilbaren zu vollziehen (zurückdatiert auf den 1. September 1939) (Beweisstück US-342). In Internationaler Militärgerichtshof Nürnberg, Der Nürnberger Prozess gegen die Hauptskriegsverbrecher vom 14. November 1945 bis 1. Oktober 1946: Urkunden und anderes Beweismaterial. Published in Nuremberg 1947. Munich: Delphin Verlag, 1989. Volume XXVI: Amtlicher Text – Deutsche Ausgabe, Nummer 405-PS bis Nummer 1063(d)-PS. Document 630-PS, p. 169.