Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever provides a fasting person with food to break his fast, there will be written for him the like of his reward, without anything being reduced from the reward of the fasting person; and whoever equips a fighter or looks after his family in his absence, he will have the like of his reward, without anything being reduced from the reward of the fighter."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5255