From Andrew's link, John Knox writing to defenders of Servetus
But now to the matter. I have before proved you malicious and venomous liars, and therefore unworthy to bear testimony against us. Now resteth to be proved, that ye are blasphemers of God, and persons defamed. Solomon affirmeth, "That he that justifieth the wicked, and he that condemneth the innocent, are alike abominable before God." [Prov. 17.] Which sentence is not to be understood of judges only, but is to be referred to every man; for of every one doth God require, that he hate, and in his heart and mouth condemn, that which God himself hath condemned; and also, that he allow and justify that which God pronounceth just, lawful, and holy. And if the contrary be found even in a multitude, God doth not only punish the chief offenders, but also upon their favorers, maintainers, and justifiers, doth he commonly pour the same plagues and vengeance. And hereof is that rare and fearful punishment taken upon Dathan and Abiram sufficient proof [Num. 16.]; for they joined with Corah were the authors of the conspiracy raised against Moses and Aaron. But did they alone sustain the vengeance? No; but their households, children, wives, tents, and substance in the same contained, did the earth in a moment devour and swallow up. And why? because they did justify the cause of those wicked, and insofar as in them lay, did maintain the same. No man, I trust, will deny, but that he who killeth an innocent man is a murderer, although it be under the cloak of justice. But that he who, having lawful authority to kill, and yet suffereth the murderer to live, is a murderer, in this perchance some men may doubt. But if the law of God be diligently searched, this doubt shall easily be resolved. For it will witness that no less ought the murderer, the blasphemer, and such other, to suffer the death, than that the meek and the fearer of God should be defended. And also, that such as maintain and defend the one, are no less criminal before God than those that oppress the others.
One example I will adduce for all. God gave into the hands of Ahab, Benhadad, king of Syria [1 Kings 20], who was great enemy to Israel; whom he upon certain conditions of amity sent home to his country. But what sentence was pronounced against Ahab? "Thus saith the Eternal, Because thou hast let go out of thy hands a man whom I appointed to die, thy soul (that is, thy life) shall be in the place of his life, and thy people in the place of his people." [verse 42.] Now to you justifiers of Servetus: Servetus was an abominable blasphemer against God; and you are justifiers of Servetus: therefore ye are blasphemers before God, like abominable as he was. The major I intend shortly to prove, so far as shall be sufficient at this time. The minor ye do not deny; for some by Apologies, some by books, and all by your tongues, do justify his cause. And the conclusion is infallibly gathered of the former words of the Holy Ghost.
Talk about an opening statement!