Mishkat al-Masabih 19 Jihad كتاب الجهاد 38

وَعَن خُرَيمِ بن فاتِكٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَنْفَقَ نَفَقَةً فِي سَبِيلِ اللَّهِ كُتبَ لَهُ بسبعمائةِ ضعف» . رَوَاهُ التِّرْمِذِيّ وَالنَّسَائِيّ

Khuraim b. Fatik reported God’s Messenger as saying, “If anyone makes a contribution towards God’s path, seven hundred times as much will be recorded to his credit.” Tirmidhi and Nasa’i transmitted it.