The Quran takes slandering of women very seriously. If anyone who blames a woman and attacks her chastity without complying stringent sharia requirements of testimony and evidence, Quran warns them of dire consequences. Look at the following verses from the Quran:

Why should we not slander a woman

It says in Surah Noor:

1. And those who launch a charge against chaste women, and produce not four witnesses (to support their allegations),- flog them with eighty stripes; and reject their evidence ever after: for such men are wicked transgressors.(24:4).
2. Why did they not produce four witnesses to it? Since they did not bring four witnesses, in Allah’s sight, they are liars. (24:13)
3. People who love to see filth being spread about concerning those who believe will have a painful punishment both in this world and the hereafter. Allah knows and you do not know. (24:19)

What should you do when you hear such rumour?

1. Why, when you heard it, did you not, as men and women of the believers, instinctively think good thoughts and say, ‘This is obviously a lie’? (24:12)
2. Why, when you heard it, did you not say, ‘We have no business speaking about this. Glory be to You! This is a terrible slander!’? (24:16)
3. Were it not for Allah’s favour to you and His mercy, both in this world and the hereafter, a terrible punishment would have afflicted you for your plunging headlong into it. (24:14)
4. You were bandying it about on your tongues, your mouths uttering something about which you had no knowledge. You considered it to be a trivial matter, but, in Allah’s sight, it is immense. (24:15)
5. Allah warns you never to repeat the like of it again if you are believers. (24:17)
6. Allah makes the Signs clear to you and Allah is All-Knowing, All-Wise. (24:18)