Matthew 27:15

ἀπολύειν κ.τ.λ. The origin of this custom is quite unknown; St Mark says, ‘as he had ever done unto them,’ as if the custom originated with Pilate; St Luke has, ‘of necessity he must release;’ St John, ‘Ye have a custom.’

No trace of this custom is found in the Talmud. But the release of prisoners was usual at certain festivals at Rome, and at Athens during the Panathenaic festival prisoners enjoyed temporary liberty. It is not, therefore, improbable that Herod the Great, who certainly familiarised the Jews with other usages of Greece and Rome, introduced this custom, and that the Roman governor, finding the custom established and gratifying to the Jews, in accordance with Roman practice (see Introd. p. 22 (3)) retained the observance of it.