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
nasai-kubra:8969 – Isḥāq b. Manṣūr > ʿAbd al-Raḥman > Sufyān > Layth > Mujāhid > Abū Hurayrah

[Machine] "Men and women approaching from behind is sinful."  

الكبرى للنسائي:٨٩٦٩ – أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ قَالَ أَخْبَرَنَا عَبْدُ الرَّحْمَنِ عَنْ سُفْيَانَ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

«إِتْيَانُ النِّسَاءِ وَالرِّجَالِ فِي أَدْبَارِهِنَّ كُفْرٌ»  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:8970 – Muḥammad b. Bashhār > ʿAbd al-Raḥman > Sufyān > Layth > Mujāhid > Abū Hurayrah

[Machine] "The coming of men and women from behind is disbelief."  

الكبرى للنسائي:٨٩٧٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

«إِتْيَانُ الرِّجَالِ وَالنِّسَاءِ فِي أَدْبَارِهِنَّ كُفْرٌ»