Dakshina is one of the limbs of sacrifice and conduces to the nourishment of the Vedas. A sacrifice without Dakshina can never bring on salvation.
यज्ञाझं दक्षिणा तात वेदानां परिबृंहणम्। न यज्ञा दक्षिणाहीनास्तारयन्ति कथंचन॥