Havya (libation of ghee) and Kavya (edible offerings) should all be presented to a Brahmana who is learned in the Vedas. As an offering of ghee to Agnis is never in vain, so a gift to the Brahmanas learned in the Vedas is never in vain.
हव्यं कव्यं च यत् किंचित् सर्वं तच्छ्रोत्रियोऽर्हति। दत्तं हि श्रोत्रिये साधौ ज्वलितेऽग्नौ यथा हुतम्॥