Sunan Ibn Majah, Volume 4, Book 24, Hadith 2759 (DarusSalam) ⓘ
It was narrated from Zaid bin Khalid Al-Juhani that the Messenger of Allah said: “Whoever equips a warrior in the cause of Allah, he will have a reward like his, without that detracting from the warrior’s reward in the slightest.”
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، عَنْ عَبْدِ الْمَلِكِ بْنِ أَبِي سُلَيْمَانَ، عَنْ عَطَاءٍ، عَنْ زَيْدِ بْنِ خَالِدٍ الْجُهَنِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ جَهَّزَ غَازِيًا فِي سَبِيلِ اللَّهِ كَانَ لَهُ مِثْلُ أَجْرِهِ مِنْ غَيْرِ أَنْ يَنْقُصَ مِنْ أَجْرِ الْغَازِي شَيْئًا " .
also referenced under: Hadith 2759 (Reference) & Book 24, Hadith 2864 (In-Book)