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:26350a –
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السيوطي:٢٦٣٥٠a –

"لا يَعْجِزَنَّ أَحَدُكُمْ إذَا دَخَلَ مِرفقَهُ أن يَقُولَ: اللَّهُمَّ إِنِّي أعُوذُ مِنَ الرِّجسِ النَّجِسِ، الخَبِيثِ المُخَبَّث، الشَّيطَانِ الرَّجِيم".  

[هـ] ابن ماجة [حب] ابن حبّان عن أبي أمامة وضُعِّف

See similar narrations below:

Collected by Ṭabarānī
tabarani:7849 – Yaḥyá b. Ayyūb > Saʿīd b. Abū Maryam > Yaḥyá b. Ayyūb > ʿUbaydullāh b. Zaḥr > ʿAlī b. Yazīd > al-Qāsim > Abū Umāmah

[Machine] The Messenger of Allah ﷺ said, "None of you should be unable, when entering his companion's armpit, to say: 'O Allah! I seek refuge in You from the impure, filthy, evil, wicked Satan.'"  

الطبراني:٧٨٤٩ – حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ ثنا سَعِيدُ بْنُ أَبِي مَرْيَمَ ثنا يَحْيَى بْنُ أَيُّوبَ عَنْ عُبَيْدِ اللهِ بْنِ زَحْرٍ عَنْ عَلِيِّ بْنِ يَزِيدَ عَنِ الْقَاسِمِ عَنْ أَبِي أُمَامَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَا يَعْجِزَنَّ أَحَدَكُمْ إِذَا دَخَلَ مِرْفَقَهُ أَنْ يَقُولَ اللهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الرِّجْسِ النَّجِسِ الْخَبِيثِ الْمُخْبِثِ الشَّيْطَانِ الرَّجِيمِ