حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ قَالَ الْمُحْصَنَاتُ مِنَ النِّسَاءِ هُنَّ أُولاَتُ الأَزْوَاجِ وَيَرْجِعُ ذَلِكَ إِلَى أَنَّ اللَّهَ حَرَّمَ الزِّنَا ‏.‏

Yahya related to me from Malik from Ibn Shihab that Said ibn al-Musayyab said, "The muhsanat among women are those who have husbands."That referred to the fact that Allah has made fornication haram. Translation Not Available

Book Ref: Muwatta Imam Malik Book 28 Hadith 1134
Web Ref:  Muwatta Imam Malik Book 28 Hadith 39