Surah Al-Ahzab, ayah 30

33:30

يَٰنِسَآءَ ٱلنَّبِيِّ مَن يَأۡتِ مِنكُنَّ بِفَٰحِشَةٖ مُّبَيِّنَةٖ يُضَٰعَفۡ لَهَا ٱلۡعَذَابُ ضِعۡفَيۡنِۚ وَكَانَ ذَٰلِكَ عَلَى ٱللَّهِ يَسِيرٗا ٣٠

Yānisā'an-nabiyyi man ya'ti minkunna bifāhishatim mubayyinatin yudā'af lahal-'adhābu di'fayni wakāna dhālika 'alallāhi yasīrā

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.