Jehovah ordered the blasphemer to be taken out of the camp, and the witnesses to lay their hands upon his head, and the whole congregation to stone him; and published at the same time the general law, that whoever cursed his God should bear (i.e., atone for) his sin (cf. Exodus 22:27), and whoever blasphemed the name of Jehovah should be stoned, the native as well as the foreigner. By laying (resting, cf. Leviticus 1:4) their hands upon the head of the blasphemer, the hearers or witnesses were to throw off from themselves the blasphemy which they had heard, and return it upon the head of the blasphemer, for him to expiate. The washing of hands in Deuteronomy 21:6 is analogous; but the reference made by Knobel to Deuteronomy 17:7, where the witnesses are commanded to turn their hand against an idolater who had been condemned to death, i.e., to stone him, is out of place.

Leviticus 24:20 Parallel Commentaries

Exodus 21:23-25 And if any mischief follow, then you shall give life for life...

Deuteronomy 19:21 And your eye shall not pity; but life shall go for life, eye for eye, tooth for tooth, hand for hand, foot for foot.

Matthew 5:38 You have heard that it has been said, An eye for an eye, and a tooth for a tooth: