आहुस्त्वामृषयः सर्वे देवर्षिर्नारदस्तथा। असितो देवलो व्यासः स्वयं चैव ब्रवीषि मे ॥

āhus tvām ṛiṣhayaḥ sarve devarṣhir nāradas tathā asito devalo vyāsaḥ svayaṁ chaiva bravīṣhi me

All the Rishis have thus acclaimed Thee, as also the divine Rishi, Nârada; so Asita, Devala, and Vyâsa; and now Thou Thyself tellest it me.

In plain words: Arjuna says that the great sages, called Rishis, have all said this about Krishna. Famous wise men like Narada, Asita, Devala and Vyasa said it too, and now Krishna Himself is telling him.