Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 27

Sanskrit:

हूयन्तामग्नय: सम्यग्ब्राह्मणैर्ब्रह्मवादिभि: । अन्नं बहुगुणं तेभ्यो देयं वो धेनुदक्षिणा: ॥ २७ ॥

ITRANS:

hūyantām agnayaḥ samyagbrāhmaṇair brahma-vādibhiḥannaṁ bahu-guṇaṁ tebhyodeyaṁ vo dhenu-dakṣiṇāḥ

Translation:

The brāhmaṇas who are learned in the Vedic mantras must properly invoke the sacrificial fires. Then you should feed the priests with nicely prepared food and reward them with cows and other gifts.

Purport:

According to Śrīla Śrīdhara Svāmī, Lord Śrī Kṛṣṇa instructed His father and other residents of Vṛndāvana in the technical details of this Vedic sacrifice to assure the quality of the sacrifice and also to inspire Nanda and the others with faith in the concept of such a sacrifice. Thus the Lord mentioned that there must be orthodox brāhmaṇas, regular sacrificial fires and proper distribution of charity. And things were to be done in the order given by the Lord.