Deuteronomy 22:21

21 then they are to take her out to the entrance of her father's house, where the men of her city are to stone her to death. She has done a shameful thing among our people by having intercourse before she was married, while she was still living in her father's house. In this way you will get rid of this evil.

Deuteronomy 22:21 Meaning and Commentary

Deuteronomy 22:21

Then they shall bring out the damsel to the door of her
father's house
For his greater disgrace, and as a sort of punishment for his neglect of her education, not taking care to instruct her, and bring her up in a better manner:

and the men of her city shall stone her with stones, that she die;
which was the death this sort of adulteresses were put to; others was by strangling, and the daughter of a priest was to be burnt; see ( Leviticus 20:10 ) ( 21:9 ) , which shows that this sin was committed by her after her espousals, as Jarchi and Aben Ezra note; or otherwise it would have been only simple fornication, which was not punishable with death:

because she hath wrought folly in Israel:
a sin, as all sin is folly, and especially any notorious one, as this was; and which is aggravated by its being done in Israel, among a people professing the true religion, and whom God had chosen and separated from all others to be a holy people to himself:

to play the whore in her father's house;
where she continued after her espousals, until she was taken to the house of her husband, to consummate the: marriage; and between the one and the other was this sin committed, and which is another reason for her execution at the door of her father's house:

so shalt thou put evil away from among you;
deter others from it by such an example, and remove the guilt of it from them, which otherwise would lie upon them, if punishment was not inflicted; the Targum of Jonathan interprets it of the putting away of her that did the evil.

Deuteronomy 22:21 In-Context

19 They are also to fine him a hundred pieces of silver and give the money to the young woman's father, because the man has brought disgrace on an Israelite woman. Moreover, she will continue to be his wife, and he can never divorce her as long as he lives.
20 "But if the charge is true and there is no proof that she was a virgin,
21 then they are to take her out to the entrance of her father's house, where the men of her city are to stone her to death. She has done a shameful thing among our people by having intercourse before she was married, while she was still living in her father's house. In this way you will get rid of this evil.
22 "If a man is caught having intercourse with another man's wife, both of them are to be put to death. In this way you will get rid of this evil.
23 "Suppose a man is caught in a town having intercourse with a young woman who is engaged to someone else.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.