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.
suyuti:2-936bʿMr
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السيوطي:٢-٩٣٦b

"عن عمر قال: من نَقَّى أنفَه أو حَكَّ إِبِطَهُ فليَتَوضَّأ".  

[ش] ابن أبى شيبة

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Collected by Suyūṭī
suyuti:2-187bʿUmar 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