Mishkat al-Masabih 19 Jihad كتاب الجهاد 11

وَعَن زيد بن خالدٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ جَهَّزَ غَازِيًا فِي سَبِيلِ اللَّهِ فَقَدْ غَزَا وَمَنْ خَلَفَ غَازِيًا فِي أَهْلِهِ فقد غزا»

Zaid b. Khalid reported God’s Messenger as saying, “He who equips a fighter in God’s path has taken part in the fighting, and he who looks after a fighter’s family when he is away has taken part in the fighting.” (Bukhari and Muslim.)