[24].Surah An-Nur [The Light]: Ayat 17-19

১৭. আল্লাহ তোমাদেরকে উপদেশ দিতেছেন, ‘তোমরা যদি মু’মিন হও তবে কখনও অনুরূপ আচোরনের পুনরাবৃত্তি করিওনা।’
১৮. আল্লাহ তোমাদের জন্য আয়াত সমূহ সুস্পষ্টভাবে বিবৃত করেন এবং আল্লাহ সর্বঞ্জ, প্রঞ্জাময়।
১৯. যাহার মু’মিনদের মধ্যে অশ্লীলতার প্রসার কামনা করে তাদের জন্য আছে দুনিয়া ও আখেরাতের মর্মন্তুদ শাস্তি এবং আল্লাহ জানেন, তোমরা জান না।
 

Ayat 17. Allah forbids you from it and warns you not to repeat the like of it forever, if you are believers.

Ayat 18. And Allah makes the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) plain to you, and Allah is All-Knowing, All-Wise.

Ayat 19. Verily, those who like that (the crime of) illegal acts such as adultery should be propagated among those who believe, they will have a painful torment in this world and in the Hereafter. And Allah knows and you know not.

[Tafseer] of ayat 17. Allah doth admonish you, that ye may never repeat such (conduct), if ye are (true) Believers. in ayat 18. its clarify that Allah makes the Signs plain to you: for Allah is full of knowledge and wisdom. in ayat 19. stern warning is given to those who love (to see) scandal published broadcast among the Believers, will have a grievous Penalty in this life and in the Hereafter: Allah knows, and ye know not. What mischief's can be planned by Evil to delude simple folk who mean no harm in their own minds but who by thoughtlessness are deluded step by step to become the instruments of Evil, may not be known to the most instructed of men, but it is all known to Allah. Man should therefore always be on his guard against the traps of Evil, and it is only Allah's grace that can save him. 

Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, "Every one of my followers will be forgiven except those who expose (openly) their wrongdoings. An example of this is that of a man who commits a sin at night which Allah has covered for him, and in the morning, he would say (to people): "I committed such and such sin last night,' while Allah had kept it a secret. During the night Allah has covered it up but in the morning he tears up the cover provided by Allah Himself.''  [Bukhari Book.08, Chapter 73, Hadith # 95]. 

Lesson : as mentioned above in Surah An-Nur Ayat 19."Verily, those who like that (the crime of) illegal acts such as adultery should be propagated" We learn from this Hadith that commission of a sin due to human frailties on which one is ashamed but does not like to express is something which might hopefully be forgiven by Allah. In fact, its remission after penitence is almost sure. But to commit a sin openly is totally different because, firstly, the heart of such a person is deprived of the fear of Allah. Secondly, he has no respect and regard for Divine injunctions. Thirdly, such a person usually does not repent his sins. Fourthly, he makes a declaration of breach of Divine injunctions which amounts to inviting His wrath and punishment.