Allah (swt) says:
وَلاَ تَقْرَبُواْ الزِّنَى إِنَّهُ كَانَ فَاحِشَةً وَسَاء سَبِيلاً
{And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way.} (Al-Isra: 32)
فَاسْتَشْهِدُواْ عَلَيْهِنَّ أَرْبَعةً مِّنكُمْ{bring against them four [witnesses] from among you}: Look at the seriousness of saving lineages and honors, that is why accusing falsely chaste women is a big sin. There has to be four people who witnessed them, in this case, families are not subject to any troubles because of the haters and mischief-makers who try to denigrating people. In fact, Islam is very keen not only on building the family through the marriage contract and its conditions, the right choice of the wife and the husband, but then, on preservation and maintenance of the marital relationship from being overwhelmed by accusations, especially in what is related to women. Islam emphasizes on this issue, and the greatest emphasis in testimony contained in the Holy Qur’an is related to women.