“Mere factual innocence is no reason not to carry out a death sentence properly reached.”
These words, which have been widely attributed to Scalia, do not appear in any of his writings or statements. http://www.snopes.com/scalia-death-penalty-quote He nonetheless remarked in Herrera v. Collins (1993, concurring) that state courts had no obligation to review a death sentence on factual innocence grounds, an opinion that he repeated in In re Davis (2009, dissenting).
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Antonin Scalia 100
former Associate Justice of the Supreme Court of the United… 1936–2016Related quotes

“There are very few innocent sentences in writing.”

2016-01-06, on the execution of Nimr Baqir al-Nimr. Interview with Muhammad bin Salman, The Economist
Rudolf Carnap (1937) cited in: Irving J. Lee (1967) The Language of Wisdom and Folly: Background Readings in Semantics. International Society for General Semantics, p. 44
Crime and Punishment. p. 146.
The Light's On At Signpost (2002)

“Happy as a Hangman,” truthdig.com http://www.truthdig.com/report/item/happy_as_a_hangman_20101206/, December 6, 2010
“It may justly be urged that, properly speaking, what alone has meaning is a sentence.”
Source: Philosophical Papers (1979), p. 56.

About speaking to Hitler. Quoted in "Hitler's Spies: German Military Intelligence in World War II" - Page 234 - by David Kahn - True Crime - 2000