Sunan Ibn Majah, Volume 4, Book 24, Hadith 2775 (DarusSalam) ⓘ
It was narrated from Anas bin Malik that the Messenger of Allah said: “Whoever goes out in the cause of Allah will have the equivalent of the dust that got on him, in musk, on the Day of Resurrection.”
حَدَّثَنَا مُحَمَّدُ بْنُ سَعِيدِ بْنِ يَزِيدَ بْنِ إِبْرَاهِيمَ التُّسْتَرِيُّ، حَدَّثَنَا أَبُو عَاصِمٍ، عَنْ شَبِيبٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ رَاحَ رَوْحَةً فِي سَبِيلِ اللَّهِ كَانَ لَهُ بِمِثْلِ مَا أَصَابَهُ مِنَ الْغُبَارِ مِسْكًا يَوْمَ الْقِيَامَةِ " .
also referenced under: Hadith 2775 (Reference) & Book 24, Hadith 2880 (In-Book)