Deuteronomy 19:1

1.When the Lord thy God hath cut off the nations. Moses repeats the same precepts which we have just been considering, that, in regard to murders, the people should distinguish between inadvertency and crime. With this view, he assigns six cities, wherein those who have proved their innocence before the judges should rest in peace and concealment. In one word, however, he defines who is to be exempt from punishment, viz., he who has killed his neighbor ignorantly, as we have previously seen; and this is just, because the will is the sole source and cause of criminality, and therefore, where there is no malicious feeling, there is no crime. But, lest under the pretext of inadvertency those who are actually guilty should escape, a mark of distinction is added, i.e., that no hatred should have preceded; and of this an instance is given, if two friends should have gone out together into a wood, and, without any quarrel or wrangling, the head of the axe should slip out of the hand of one of them, and strike the other. God, therefore, justly commands that the motive of the crime should be investigated, and shows how it is to be ascertained, viz., if there had been any previous animosity, or if any contention should have arisen. For it is incredible that any one should be so wicked as gratuitously to rush into so abominable a sin. It must be observed, however, that there was no room for this conjecture, except in a doubtful matter; for if any should stab his neighbor with a drawn sword, or should hurl a dart into his bosom, the inquiry would be superfluous, because the guilty intention would be abundantly manifest.