A gift of food made to a Brahmana becoines eternal. One made to a Shudra yields great merit. This is the difference between the merits of the gifts of food made to Brahmanas and Shudras.
ब्राह्मणेष्वक्षयं दानमन्नं शूद्रे महाफलम्। अन्नदानं हि शूद्रे च ब्राह्मणे च विशिष्यते॥