Busy doing my reading for my conversion. In my history book, I’m on the Holocaust section. Here’s a quote which should be handy to show to any Holocaust-deniers you come across.
But at the same time [July 1941] an additional oral order was given by Hitler to Heydrich and transmitted to Eichmann: ‘I have just come from the Reichsführer: the Führer has now ordered the physical annihilation of the Jews.’
— A History of the Jews by Paul Johnson
He cites, for the quotation, Jochen von Lang, Eichmann Interrogated (New York 1973), pp. 74-5.