Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:3197 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū Bakr b. Isḥāq al-Faqīh > al-Ḥasan b. ʿAlī b. Ziyād > Saʿīd b. Manṣūr > Abū al-Aḥwaṣ > Abū Isḥāq > al-Ḥārith > ʿAlī

[Machine] Ali said, "When a woman prostrates, let her squeeze her thighs together. It has been narrated that there are two weak hadiths about this matter, which cannot be used as evidence."  

البيهقي:٣١٩٧ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنبأ أَبُو بَكْرِ بْنُ إِسْحَاقَ الْفَقِيهُ أنبأ الْحَسَنُ بْنُ عَلِيِّ بْنِ زِيَادٍ قَالَ ثنا سَعِيدُ بْنُ مَنْصُورٍ ثنا أَبُو الْأَحْوَصِ عَنْ أَبِي إِسْحَاقَ عَنِ الْحَارِثِ قَالَ

قَالَ عَلِيٌّ ؓ إِذَا سَجَدْتِ الْمَرْأَةُ فَلْتَضُمَّ فَخِذَيْهَا وَقَدْ رُوِيَ فِيهِ حَدِيثَانِ ضَعِيفَانِ لَا يُحْتَجُّ بِأَمْثَالِهِمَا  

See similar narrations below:

Collected by Suyūṭī