Mbh 2.32.6

“Simultaneously with these words of king Yudhisthira the just, Sahadeva that foremost of warriors, having accomplished everything, represented the matter to the king. And Dwaipayana, O king, then appointed as sacrificial priests exalted Brahmanas that were like the Vedas themselves in embodied forms. The son of Satyavati became himself the Brahma of that sacrifice. And that bull of the Dhananjaya race, Susaman, became the chanter of the Vedic (Sama) hymns. Yajnavalkya devoted to Brahma became the Adhyaryu, and Paila--the son of Vasu and Dhaumya became the Hotris. And O bull of the Bharata race, the disciples and the sons of these men, all well-acquainted with the Vedas and the branches of the Vedas, became Hotragts. And all of them, having uttered benedictions and recited the object of the sacrifice, worshipped, according to the ordinance the large sacrificial compound. Commanded by the Brahmanas, builders and artificers erected numerous edifices there that were spacious and well-perfumed like unto the temples of the gods. After these were finished, that best of kings and that bull among men Yudhishthira. commanded his chief adviser Sahadeva, saying,--‘Despatch thou, without loss of time, messengers endued with speed to invite all to the sacrifice. And Sahadeva, hearing these words of the king, despatched messengers telling them,--‘Invite ye all the Brahmanas in the kingdom and all the owners of land (Kshatriyas) and all the Vaisyas and also all the respectable Sudras, and bring them hither!’