It is narrated from Sayyiduna al-Miqdam bin Ma'di Karib (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "Whatever you feed your wife is charity (sadaqah) for you, whatever you feed your children is charity for you, whatever you feed your servant is charity for you, and whatever you feed yourself is charity for you."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17768