A.T. Robertson Commentary Matthew 26:24

"The Son of man goeth, even as it is written of him: but woe unto that man through whom the Son of man is betrayed! good were it for that man if he had not been born." — Matthew 26:24 (ASV)

Good were it for that man (καλον ην αυτω). Conclusion of second-class condition even though αν is not expressed. It is not needed with verbs of obligation and necessity. There are some today who seek to palliate the crime of Judas. But Jesus here pronounces his terrible doom. And Judas heard it and went on with his hellish bargain with the Sanhedrin. Apparently Judas went out at this stage (John 13:31).