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:14090 – Abū al-Ḥasan ʿAlī b. Muḥammad al-Muqriʾ > al-Ḥasan b. Muḥammad b. Isḥāq > Yūsuf b. Yaʿqūb > Muḥammad b. Abū Bakr > al-Muʿtamir b. Sulaymān > Layth > ʿĀṣim > Abū al-Mustahil > ʿUmar > Nabī Allāh ﷺ > Idhā Atá Aḥadukum Ahlah Faʾarād

[Machine] If he returns, he should wash his private parts. This is the most correct opinion according to Al-Layth ibn Abi Sulaim. However, it is not used as evidence. In the hadith of Abu Sa'eed, it is sufficient. And there is a hadith narrated in between them regarding washing which is not strong.  

البيهقي:١٤٠٩٠ – وَقَدْ أَخْبَرَنَا أَبُو الْحَسَنِ عَلِيُّ بْنُ مُحَمَّدٍ الْمُقْرِئُ أنبأ الْحَسَنُ بْنُ مُحَمَّدِ بْنِ إِسْحَاقَ ثنا يُوسُفُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ أَبِي بَكْرٍ ثنا الْمُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ لَيْثٍ عَنْ عَاصِمٍ عَنْ أَبِي الْمُسْتَهِلِّ عَنْ عُمَرَ ؓ أَنَّ نَبِيَّ اللهِ ﷺ قَالَ إِذَا أَتَى أَحَدُكُمْ أَهْلَهُ فَأَرَادَ

أَنْ يَعُودَ فَلْيَغْسِلْ فَرْجَهُ هَذَا أَصَحُّ وَلَيْثُ بْنُ أَبِي سُلَيْمٍ لَا يُحْتَجُّ بِهِ وَفِي حَدِيثِ أَبِي سَعِيدٍ كِفَايَةٌ وَقَدْ رُوِيَ فِي الْغُسْلِ بَيْنَ ذَلِكَ حَدِيثٌ لَيْسَ بِقَوِيٍّ