Manava Dharmashastra 3.96

3.96

bhikṣām apy udapātraṃ vā satkṛtya vidhipūrvakam
vedatattvārthaviduṣe brāhmaṇāyopapādayet //

Let him give, in accordance with the rule, to a Brahmana who knows the true meaning of the Veda, even (a small portion of food as) alms, or a pot full of water, having garnished (the food with seasoning, or the pot with flowers and fruit).