يٰنِسَاۤءَ النَّبِيِّ لَسْتُنَّ كَاَحَدٍ مِّنَ النِّسَاۤءِ اِنِ اتَّقَيْتُنَّ فَلَا تَخْضَعْنَ بِالْقَوْلِ فَيَطْمَعَ الَّذِيْ فِيْ قَلْبِهٖ مَرَضٌ وَّقُلْنَ قَوْلًا مَّعْرُوْفًاۚ ( الأحزاب: ٣٢ )
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 (al-ʾAḥzāb 33:32)
Sahih International:
O wives of the Prophet, you are not like anyone among women. If you fear Allah, then do not be soft in speech [to men], lest he in whose heart is disease should covet, but speak with appropriate speech. (Al-Ahzab [33] : 32)
1 Mufti Taqi Usmani
O wives of the prophet, you are not like any other women, if you observe taqwā (righteousness). So, do not be too soft in your speech, lest someone having disease in his heart should develop fancies (about you); and do speak with appropriate words.