Al Ahzab Ayah 30

يَـٰنِسَآءَ ٱلنَّبِىِّ مَن يَأْتِ مِنكُنَّ بِفَـٰحِشَةٍ مُّبَيِّنَةٍ يُضَـٰعَفْ لَهَا ٱلْعَذَابُ ضِعْفَيْنِ‌ۚ وَكَانَ ذَٲلِكَ عَلَى ٱللَّهِ يَسِيرًا ٣٠ O wives of the Prophet! If any of you were to commit a blatant misconduct, the punishment would be doubled for her. And that is easy for Allah.