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
nasai:2053 – Ibrāhīm b. al-Ḥasan > Ḥajjāj > Layth b. Saʿd > Muʿāwiyah b. Ṣāliḥ > Ṣafwān b. ʿAmr > Rāshid b. Saʿd

"O Messenger of Allah, why will the believers be tested in their graves except the martyr?" He said: "The flashing of the swords above his head is trial enough."  

النسائي:٢٠٥٣ – أَخْبَرَنَا إِبْرَاهِيمُ بْنُ الْحَسَنِ قَالَ حَدَّثَنَا حَجَّاجٌ عَنْ لَيْثِ بْنِ سَعْدٍ عَنْ مُعَاوِيَةَ بْنِ صَالِحٍ أَنَّ صَفْوَانَ بْنَ عَمْرٍو حَدَّثَهُ عَنْ رَاشِدِ بْنِ سَعْدٍ

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّ رَجُلاً قَالَ يَا رَسُولَ اللَّهِ مَا بَالُ الْمُؤْمِنِينَ يُفْتَنُونَ فِي قُبُورِهِمْ إِلاَّ الشَّهِيدَ قَالَ كَفَى بِبَارِقَةِ السُّيُوفِ عَلَى رَأْسِهِ فِتْنَةً  

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:2191 – Ibrāhīm b. al-Ḥasan > Ḥajjāj b. Muḥammad > Layth b. Saʿd > Muʿāwiyah b. Ṣāliḥ > Ṣafwān b. ʿAmr > Rāshid b. Saʿd

"O Messenger of Allah, why will the believers be tested in their graves except the martyr?" He said: "The flashing of the swords above his head is trial enough." (Using translation from Nasāʾī 2053)  

الكبرى للنسائي:٢١٩١ – أَخْبَرَنِي إِبْرَاهِيمُ بْنُ الْحَسَنِ حَدَّثَنِي حَجَّاجُ بْنُ مُحَمَّدٍ عَنْ لَيْثِ بْنِ سَعْدٍ عَنْ مُعَاوِيَةَ بْنِ صَالِحٍ أَنَّ صَفْوَانَ بْنَ عَمْرٍو حَدَّثَهُ عَنْ رَاشِدِ بْنِ سَعْدٍ

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّ رَجُلًا قَالَ يَا رَسُولَ اللهِ مَا بَالُ الْمُؤْمِنِينَ يُفْتَنُونَ فِي قُبُورِهِمْ إِلَّا الشَّهِيدَ؟ قَالَ «كَفَى بِبَارِقَةِ السُّيُوفِ عَلَى رَأْسِهِ فِتْنَةً»  

suyuti:654-88b – Rāshid b. Saʿd
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السيوطي:٦٥٤-٨٨b –

"عَنْ رَاشِدِ بن سَعْدٍ، عَنْ رَجُلِ مِنْ أَصْحَابِ النَّبِيِّ ﷺ : أَنَّ رَجُلًا قَالَ يَا رَسُولَ اللهِ: مَا بَالُ الْمُؤْمِنينَ يفتتنون فِي قبورهم إِلَّا الشَّهِيدَ؟ قَالَ: كَفَى ببارقة السيوف عَلَى رَأسِهِ فِتْنَةً".  

[ن] النسائي والديلمي وسنده صحيح