Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: "Indeed, those who love that indecency should spread among the believers" [Surah An-Nur: 19]: this refers to the chaste men and women from among those who affirm the truth. "Will have a painful punishment" [Surah An-Nur: 19], meaning agonising. "In this world and the Hereafter" [Surah An-Nur: 19], meaning lashes in this world and the punishment of Hell in the Hereafter. "And Allah knows and you do not know" [Surah Al-Baqarah: 216], meaning He knows what you have fallen into and the severe punishment it carries, and you do not know the severity of Allah's intense anger towards whoever does such a thing.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19515