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
suyuti:2-188b – ʿUmar b. al-Khaṭṭāb
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السيوطي:٢-١٨٨b –

"عَنْ عُمَرَ بْنِ الْخَطَّابِ قَالَ: مَنْ نَامَ مُضْطَجِعًا فَلْيَتَوضَّأ".  

مالك، [عب] عبد الرازق [ش] ابن أبى شيبة والحرث، [ق] البيهقى في السنن

See similar narrations below:

Collected by Suyūṭī
suyuti:2-187b – ʿUmar b. al-Khaṭṭāb
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السيوطي:٢-١٨٧b –

"عَنْ عُمَرَ بْنِ الْخَطَّابِ قَالَ: مَنْ مَسَّ (إِبِطَهُ) فَليَتَوَضَّأ".  

[عب] عبد الرازق [ض] ضياء المقدسي في مختاره [ق] البيهقى في السنن