Sunan Ibn Majah, Hadith 2762 ⓘ
It was narrated from Abu Umamah that the Prophet said: “Whoever does not fight, or equip a fighter, or stay behind to look after a fighter’s family, Allah will strike him with a calamity before the Day of Resurrection.”
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا يَحْيَى بْنُ الْحَارِثِ الذِّمَارِيُّ، عَنِ الْقَاسِمِ، عَنْ أَبِي أُمَامَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ لَمْ يَغْزُ أَوْ يُجَهِّزْ غَازِيًا أَوْ يَخْلُفْ غَازِيًا فِي أَهْلِهِ بِخَيْرٍ أَصَابَهُ اللَّهُ سُبْحَانَهُ بِقَارِعَةٍ قَبْلَ يَوْمِ الْقِيَامَةِ " .
also referenced under: Book 24, Hadith 2867 (In-Book) & Volume 4, Book 24, Hadith 2762 (DarusSalam)