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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-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»  

See similar narrations below:

Collected by Nasāʾī, 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  

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