Qur'an 33:30

يَـٰنِسَآءَ ٱلنَّبِىِّ مَن يَأْتِ مِنكُنَّ بِفَـٰحِشَةٍ مُّبَيِّنَةٍ يُضَـٰعَفْ لَهَا ٱلْعَذَابُ ضِعْفَيْنِ ۚ وَكَانَ ذَٰلِكَ عَلَى ٱللَّهِ يَسِيرًا

“O wives of the Prophet, whoever of you should commit a clear immorality - for her the punishment would be doubled two fold, and ever is that, for Allāh, easy.”

Al-Ahzaab 33:30 · Saheeh International