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:21163a –
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السيوطي:٢١١٦٣a –

"مَنْ تَنَخَّع في الْمَسْجِد فَلَمْ يَذفنْهُ فَسَيِّئَةٌ، وَإِنْ دَفَنَهُ فَحَسَنَةٌ".  

[ع] أبو يعلى [طب] الطبرانى في الكبير وابن النجار، [ض] ضياء المقدسي في مختاره عن أَبي أُمامة

See similar narrations below:

Collected by Ṭabarānī
tabarani:8092 – Muḥammad b. Qaḍāʾ al-Jawharī al-Baṣrī > Muḥammad b. ʿAlī b. al-Ḥasan b. Shaqīq from my father > al-Ḥusayn b. Wāqid > Abū Ghālib > Abū Umāmah

[Machine] The Messenger of Allah ﷺ said, "Whoever takes a dump in the mosque and does not bury it, it is a bad deed. But if he buries it, it is a good deed."  

الطبراني:٨٠٩٢ – حَدَّثَنَا مُحَمَّدُ بْنُ قَضَاءٍ الْجَوْهَرِيُّ الْبَصْرِيُّ ثنا مُحَمَّدُ بْنُ عَلِيِّ بْنِ الْحَسَنِ بْنِ شَقِيقٍ قَالَ سَمِعْتُ أَبِي أنا الْحُسَيْنُ بْنُ وَاقِدٍ عَنْ أَبِي غَالِبٍ عَنْ أَبِي أُمَامَةَ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «مَنْ تَنَخَّعَ فِي الْمَسْجِدِ فَلَمْ يَدْفِنْهُ فَسَيِّئَةٌ وَإِنْ دَفَنَهُ حَسَنَةٌ»