mitrā-varuṇayor ṛṣī

valmikih-Valmiki; ca-and; maha-yogi-the great mystic; valmikat-from an anthill; abhavat-took birth; kila-indeed; agastyah-Agastya; ca-and; vasisthah-Vasistha; ca-also; mitra-varunayoh-of Mitra and Varuna; rsi-the two sages.