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:2-1662b – Zayd b. Aslam n ʿUmar b. al-Khaṭṭāb
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السيوطي:٢-١٦٦٢b –

"عَنْ زَيْدِ بْنِ أَسْلَمَ أن عُمَرَ بْنَ الْخَطَّابِ، قَال: لَا يُصَلِّى أَحَدُكُم وَهُوَ ضَامٌّ بِيْنَ وَرِكيْهِ".  

مالك

See similar narrations below:

Collected by Mālik
malik:9-57 – Mālik > Zayd b. Aslam > ʿUmar b. al-Khaṭṭāb

Yahya related to me from Malik from Zayd ibn Aslam that Umar ibn al-Khattab said, "You should not pray while you are holding your bowels."  

مالك:٩-٥٧ – وَحَدَّثَنِي عَنْ مَالِكٍ عَنْ زَيْدِ بْنِ أَسْلَمَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ لاَ يُصَلِّيَنَّ أَحَدُكُمْ وَهُوَ ضَامٌّ بَيْنَ وَرِكَيْهِ