Hadithcore
Mishkat al-Masabih, 3842

He reported God's Messenger as saying, “The fighter gets his reward, and the one who equips him gets his own reward and that of the fighter.” Abu Dawud transmitted it.

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لِلْغَازِي أَجْرُهُ وَلِلْجَاعِلِ أَجْرُهُ وَأَجْرُ الْغَازِي» . رَوَاهُ أَبُو دَاوُد

References1 variant
In-Book Reference
Book 19, Hadith 54