Hazrat Ibn Jurayj says that I asked Hazrat Ata: We keep food stored with us with the intention of eating it, and a year passes over it (what is the ruling about this)? He replied, there is no zakat on it for you. Then he said, by my life, we do the same: we buy food and do not pay zakat on it. When you buy food with the intention of selling it, then pay zakat on it.