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:22316a –
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السيوطي:٢٢٣١٦a –

"مَنْ عَلِمَ مِن أَخِيه سَيِّئَةً فَسَتَرَهَا عَلَيهِ سَتَرَ اللهُ عَلَيهِ يَوْمَ الْقِيَامَةِ".  

[طب] الطبرانى في الكبير عن عقبة بن عامر ومَسلمة بن مُخَلَّد

See similar narrations below:

Collected by Ṭabarānī
tabarani:15091 – Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Ibrāhīm b. al-Ḥasan al-ʿAllāf > Hilāl b. Ḥiq > Ibn ʿAwf And Hishām > Muḥammad b. Sīrīn

[Machine] I did not come to visit you, but I have heard a conversation from the Prophet Muhammad ﷺ that I was with him on that day. He said, "Whoever knows a bad thing about his brother and covers it, Allah will cover him on the Day of Resurrection."  

الطبراني:١٥٠٩١ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثَنَا إِبْرَاهِيمُ بْنُ الْحَسَنِ الْعَلَّافُ ثَنَا هِلَالُ بْنُ حِقٍّ عَنِ ابْنِ عَوْفٍ وَهِشَامٍ عَنْ مُحَمَّدِ بْنِ سِيرِينَ قَالَ خَرَجَ عُقْبَةُ بْنُ عَامِرٍ إِلَى مَسْلَمَةَ بْنِ مَخْلَدٍ وَهُوَ أَمِيرٌ عَلَى مِصْرَ وَكَانَ بَيْنَهُ وَبَيْنَ النُّوَّابِ شَيْءٌ فَلَمَّا أَتَى دَخَلَ عَلَيْهِ فَقَالَ مَرْحَبًا بِأَخِي أَتَانِي زَائِرًا قَالَ

لَمْ آتِكَ زَائِرًا وَلَكِنْ حَدِيثٌ سَمِعْتُهُ مِنْ رَسُولِ اللهِ ﷺ كُنْتَ مَعِي يَوْمَئِذٍ قَالَ «مَنْ عَلِمَ مِنْ أَخِيهِ سَيِّئَةً فَسَتَرَهَا عَلَيْهِ سَتَرَ اللهُ عَلَيْهِ يَوْمَ الْقِيَامَةِ»