Mahabharata 14.71.5

14.71.5

aśvavidyāvidaścaiva sūtā viprāśca tadvidaḥ |
medhyamaśvaṃ parīkṣantāṃ tava yajñārthasiddhaye || 5 ||

"Vyasa said, 'Myself, O son of Kunti, and Paila and Yajnavalkya, shall without doubt, achieve every rite at the proper time. The rite of initiating thee will be performed on the day of full moon belonging to the month of Chaitra. Let all the necessaries of the sacrifice, O foremost of men, be got ready. Let Sutas well-versed in the science of horses, and let Brahmanas also possessed of the same lore, select, after examination, a worthy horse in order that thy sacrifice maybe completed. Loosening the animal according to the injunctions of the scriptures, let him wander over the whole Earth with her belt of seas, displaying thy blazing glory, O king!'