Sunan an-Nasa'i
Sunan an-Nasa'i 2053
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 صلى الله عليه وسلم أَنَّ رَجُلاً قَالَ يَا رَسُولَ اللَّهِ مَا بَالُ الْمُؤْمِنِينَ يُفْتَنُونَ فِي قُبُورِهِمْ إِلاَّ الشَّهِيدَ قَالَ " كَفَى بِبَارِقَةِ السُّيُوفِ عَلَى رَأْسِهِ فِتْنَةً " .
Ibrahim ibn al-Hasan informed us: Hajjaj narrated to us, from Layth ibn Sad, from Muawiyah ibn Salih, that Safwan ibn Amr related to him, from Rashid ibn Sad, from a man among the Companions of the Prophet ﷺ, that a man said: Messenger of Allah, why are believers tested in their graves, except for the martyr? He replied: The flashing of swords above his head is trial enough for him.
Translation notes
The first Companion in the chain is unnamed in the source.