According to search-discovered classical Islamic scholarship, the concept of the righteous woman (As-Saliha) is centrally defined in the Quran through the description in Surah An-Nisa 4:34: 'Salihat Qanitat Hafizat lil-ghayb'. Tafsir by authorities such as Ibn Kathir and Al-Tabari explains this as a woman who is first and foremost righteous and pious. This righteousness manifests in two key marital qualities: being 'Qanitat' (devoutly obedient to Allah, and by extension, her husband in permissible matters) and 'Hafizat lil-ghayb' (guarding the unseen). Al-Qurtubi elaborates that 'guarding the unseen' is a sacred trust (Amanah) encompassing her chastity, and her husband's honor, children, and property in his absence. This isn't merely a social contract but a divine charge, as the verse concludes 'bima hafiza Allah' (what Allah has protected/commanded to be guarded). The synthesis of these qualities across classical interpretations presents a model of female virtue where piety, loyalty, and trustworthiness are paramount for the sanctity and stability of the Islamic family.