[Machine] I went to Al-Miqdad ibn Al-Aswad, the horseman of the Messenger of Allah ﷺ , while he was sitting on a tomb made of "Sayyara" (a type of stone), and he was separating bones from it while intending to go for battle. I said, "May Allah forgive you." He replied, "Come to the Surah of Al-Buhuth." Allah Almighty said, "March forth lightly or heavily" [Surah At-Tawbah 9:41], meaning the Surah of At-Tawbah. "This is a correct narration, and they did not deny it."
وَافَيْتُ الْمِقْدَادَ بْنَ الْأَسْوَدِ فَارِسَ رَسُولِ اللَّهِ ﷺ جَالِسًا عَلَى تَابُوتٍ مِنْ تَوَابِيتِ الصَّيَارِفَةِ وَفَصَلَ عَنْهَا عَظْمًا وَهُوَ يُرِيدُ الْغَزْوَ فَقُلْتُ لَقَدْ أَعْذَرَ اللَّهُ إِلَيْكَ فَقَالَ ائْتِ عَلَى سُورَةِ الْبُحُوثِ قَالَ اللَّهُ ﷻ {انْفِرُوا خِفَافًا وَثِقَالًا} [التوبة 41] يَعْنِي سُورَةَ التَّوْبَةِ «هَذَا صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ» صحيح