ভূমিকা
And, the punishment of accusing married and chaste women is more severe. Since the pervious verses consist of a heavy punishment for men and women who commit fornication, and it is possible that some impious malicious individuals accuse a few pure and chaste persons, thus immediately after mentioning of severe punishment of adulterers, the punishment of those who accuse others and intend to misuse this ordinance is declared, so that the honor and respect of chaste families can be saved from the threat of such persons, and no one dare denigrate people.
At first, it says: " And those who accuse chaste women (with adultery) but do not bring four witnesses, then scourge them (with) eighty stripes ..." After this heavy punishment, two more ordinances are added, where it says: "...
and do not (afterward) accept their testimony forever, and these are they that are evil-doers," Thus, in this way, not only such persons are heavily punished, but also their testimony and speech is invalid and invaluable in a long term, so that they cannot defame pure individuals. Moreover, the mark of impurity is set on them and they will be scandalized in the society.
This austereness in saving reputation of pure people is not limited to this case here, but it is also seen in many Islamic teachings. It indicates how extremely Islam values reputation of pure female and male believers.