Surah Al-Ahzab (The Enemy Alliance), Verse 32

یٰنِسَآءَ النَّبِیِّ لَسْتُنَّ كَاَحَدٍ مِّنَ النِّسَآءِ اِنِ اتَّقَیْتُنَّ فَلَا تَخْضَعْنَ بِالْقَوْلِ فَیَطْمَعَ الَّذِیْ فِیْ قَلْبِهٖ مَرَضٌ وَّقُلْنَ قَوْلًا مَّعْرُوْفًا ۟

Yaa nisaaa'an Nabiyyi lastunna ka ahadim minan nisaaa'i init taqaitunna falaa takhda'na bilqawli fa yatma'al lazee fee qalbihee maradunw wa qulna qawlam ma'roofaa

“O Consorts of the Prophet! Ye are not like any of the (other) women: if ye do fear (Allah), be not too complacent of speech, lest one in whose heart is a disease should be moved with desire: but speak ye a speech (that is) just.”

Quran 33:32 (Yusuf Ali Translation)