Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever gives a fasting person food to break his fast will have a reward equal to that of the fasting person, and this will not reduce anything from the fasting person's reward. And whoever equips a fighter in the path of Allah, or looks after his family in his absence, will have a reward equal to that of the fighter, and this will not reduce anything from the fighter's reward."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5253