The Nārāyaṇa section of the Śāntiparvan 12.321.9

Nārāyaṇīya 12.321.9

kṛte yuge mahārāja purā svāyaṃbhuve 'ntare
naro nārāyaṇaś caiva hariḥ kṛṣṇas tathaiva ca //