It is narrated from Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever equips a fighter in the way of Allah, it is as though he himself has fought, and whoever looks after the fighter's household well in his absence, it is as though he too has fought."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17939