It is narrated from Sayyiduna Zayd bin Khalid (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever equips a fighter in the path of Allah, or looks after his family well in his absence, will have the like of the fighter's reward, without anything being reduced from his reward; and whoever provides a fasting person with food to break his fast will have the like of his reward."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5257