See the marginal references.

Then shall ye do unto him as he had thought to have done unto his brother - Nothing can be more equitable or proper than this, that if a man endeavor to do any injury to or take away the life of another, on detection he shall be caused to undergo the same evil which he intended for his innocent neighbor.

Some of our excellent English laws have been made on this very ground. In the 37th of Edw. III., chap. 18, it is ordained that all those who make suggestion shall incur the same pain which the other should have had, if he were attainted, in case his suggestions be found evil. A similar law was made in the 38th of the same reign, chap. 9. By a law of the twelve Tables, a false witness was thrown down the Tarpeian rock. In short, false witnesses have been execrated by all nations.

Then shall ye do unto him as he had thought to have done unto his brother,.... Inflict the same fine or punishment on him he thought to have brought his brother under by his false testimony of him; whether any pecuniary fine, or whipping and scourging, or the loss of a member, or the value of it, or death itself; whether stoning, strangling, burning, or killing with the sword: though, in the case of accusing a priest's daughter of adultery, as Jarchi observes, such were not to be burnt, as would have been her case if proved, but strangled:

so shalt thou put the evil away from among you; the evil man that bears a false testimony of his brother, or the guilt of sin which would be incurred by conniving at him.

Then shall ye do unto him, as he had thought to have done unto his brother: so shalt thou put the evil away from among you.

19:15-21 Sentence should never be passed upon the testimony of one witness alone. A false witness should suffer the same punishment which he sought to have inflicted upon the person he accused. Nor could any law be more just. Let all Christians not only be cautious in bearing witness in public, but be careful not to join in private slanders; and let all whose consciences accuse them of crime, without delay flee for refuge to the hope set before them in Jesus Christ.