So when they continued asking him. — He would have avoided their question, and continued, as is here implied, for some time in the action of writing; but they will now interrupt that action. It seems to them that He cannot avoid the snare in which they have placed Him, and that He is seeking the only escape in silence. But there is an answer of which they think not, and this He stands up to give.
He that is without sin among you. — The word rendered “without sin” is frequent in the classical writers, but is found in this place only in the New Testament. It takes here a special meaning from the context, and is to be understood of the class of sins of which her sin was an instance. (Comp. the word “sinner” as used in Luke 7:37.) Of the immorality among the Jewish rulers, which gives force to these words, evidence is not wanting. Still the wider meaning is probably not excluded. They who ask this question about the Seventh Commandment were themselves breaking the Sixth and the Ninth. It is to be noted, in the application of this answer, that our Lord does not lay down sinlessness as the necessary condition of fitness for taking part in the punishment of guilt. This would be to nullify law, for there could be then no human executive power. He is not speaking in a case brought before the appointed tribunal, but in a case where men assume to themselves the position of judges of another’s guilt. In the judge, while he wears the robe of justice, the individual man ceases to exist, and he becomes the representative of God; but these can now speak only as men, and condemn her only by the contrast of a higher purity. (Comp. Notes on John 10:34 et seq.)
Let him first cast a stone at her. — The Received text and some MSS. (not including the Cambridge MS.) read “the stone,” the stone referred to in John 8:5. “Let him first” means “let him first of you”; not “let him cast the first stone.” This was the duty of the witnesses. (See marginal reference.) We must not take the words to express permission only; it is an imperative, expressing command.