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
ahmad:151 – Yaḥyá b. Ghaylān > Rishdīn b. Saʿd > Abū ʿAbdullāh al-Ghāfiqī > Zayd b. Aslam > Abīhiʿan ʿUmar b. al-Khaṭṭāb

It was narrated from 'Umar bin al Khattab ؓ from the Prophet ﷺ that he did wudoo' in the year of tabook, washing each part once.  

أحمد:١٥١ – حَدَّثَنَا يَحْيَى بْنُ غَيْلانَ حَدَّثَنَا رِشْدِينُ بْنُ سَعْدٍ حَدَّثَنِي أَبُو عَبْدِ اللهِ الْغَافِقِيُّ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ أَبِيهِعَنْ عُمَرَ بْنِ الْخَطَّابِ

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ تَوَضَّأَ عَامَ تَبُوكَ وَاحِدَةً وَاحِدَةً