Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 251

وَعَنْ أَنَسٍ قَالَ: لَمَّا حُمِلَتْ جِنَازَةُ سَعْدِ بْنِ مُعَاذٍ قَالَ الْمُنَافِقُونَ: مَا أَخَفَّ جِنَازَتَهُ وَذَلِكَ لِحُكْمِهِ فِي بَنِي قُرَيْظَةَ فَبَلَغَ ذَلِكَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «إِنَّ الْمَلَائِكَة كَانَت تحمله» . رَوَاهُ التِّرْمِذِيّ

Anas told that when Sa’d b. Mu’adh’s bier was carried the hypocrites said, “How light his bier is[*]!” that being because of his decision regarding the B. Quraiza. When the Prophet was told of that he said, “The angels were carrying it.” *This was said to show how they despised him because of his decision regarding the B. Quraiza. Tirmidhi transmitted it.