Srimad Bhagavatam Canto 10, Chapter 24, Text 27

 SB 10.24.27

huyantam agnayah samyag
 brahmanair brahma-vadibhih
annam bahu-gunam tebhyo
 deyam vo dhenu-daksinah
 
Translation: 
 
The brahmanas 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 Srila Sridhara Svami, Lord Sri Krsna instructed His father and other residents of Vrndavana 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 brahmanas, regular sacrificial fires and proper distribution of charity. And things were to be done in the order given by the Lord.
Srimad Bhagavatam Canto 10, Chapter 24, Text 26
Srimad Bhagavatam Canto 10, Chapter 24, Text 28