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:495 – Abū ʿAbdullāh al-Ḥāfiẓ Ijāzah > Abū Bakr b. Isḥāq al-Faqīh > ʿAbdullāh b. Muḥammad > Isḥāq > Sufyān > Muṭarrif > Saʿīd b. ʿAmr b. Saʿīd > ʿUmar

[Machine] Umar said, "Urination while standing is more hygienic for the anus."  

البيهقي:٤٩٥ – أَنْبَأَنِي أَبُو عَبْدِ اللهِ الْحَافِظُ إِجَازَةً أنبأ أَبُو بَكْرِ بْنُ إِسْحَاقَ الْفَقِيهُ أنبأ عَبْدُ اللهِ بْنُ مُحَمَّدٍ ثنا إِسْحَاقُ أنا سُفْيَانُ عَنْ مُطَرِّفٍ عَنْ سَعِيدِ بْنِ عَمْرِو بْنِ سَعِيدٍ قَالَ

قَالَ عُمَرُ ؓ الْبَوْلُ قَائِمًا أَحْصَنُ لِلدُّبُرِ