Mahabharata 12.60.41

12.60.41

saṃsṛṣṭā brāhmaṇaireva triṣu varṇeṣu sṛṣṭayaḥ |
devānāmapi ye devā yadbrūyuste paraṃ hi tat |
tasmādvarṇaiḥ sarvayajñāḥ saṃsṛjyante na kāmyayā || 41 ||

It has been ordained for the Sudra also, O Bharata! A Sudra, however, is not competent to titter swaha and swadha or any other Vedic mantra. For this reason, the Sudra, without observing the vows laid down in the Vedas, should worship the gods in minor sacrifices called Paka-yajnas. The gift called Purna-patra is declared to be the Dakshina of such sacrifices. It has been heard by us that in days of old a Sudra of the name of Paijavana gave a Dakshina (in one of his sacrifices) consisting of a hundred thousand [paragraph continues] Purnapatras, according to the ordinance called Aindragni. Sacrifice (as has been already said), is as much laid down for the Sudra as for the three other classes. Of all sacrifices, devotion has been laid down to be the foremost. Devotion is a high deity. It cleanses all sacrificers. Then again Brahmanas are the foremost of gods unto their respective Sudra attendants. They worship the gods in sacrifices, for obtaining the fruition of various wishes. The members of the three other classes have all sprung from the Brahmanas. The Brahmanas are the gods of the very gods. Whatever they would say would be for thy great good. Therefore, all kinds of sacrifices naturally appertain to all the four orders. The obligation is not one whose discharge is optional. The Brahmana, who is conversant with Richs, Yajuses, and Samans, should always be worshipped as a god. The Sudra, who is without Richs and Yajuses and Samans, has Prajapati for his god.