John Calvin Commentary Matthew 26:48

"Now he that betrayed him gave them a sign, saying, Whomsoever I shall kiss, that is he: take him." — Matthew 26:48 (ASV)

Now he who betrayed him. I have no doubt that Judas was restrained, either by reverence for our Lord or by shame for his crime, from venturing openly to avow himself as one of the enemies; and the warning which, Mark tells us, he gave the soldiers—to lead him away cautiously, was given, I conjecture, for this reason: that he recollected the numerous proofs by which Christ had formerly attested his divine power. But it was, at the same time, astonishing madness, either to attempt to conceal himself by frivolous hypocrisy when he came into the presence of the Son of God, or to oppose the tricks and dexterity of men to his boundless power.