Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
मन्ये कृष्णं च रामं च प्राप्ताविह सुरोत्तमौ ।सुराणां महदर्थाय गर्गस्य वचनं यथा ॥ २३ ॥
ITRANS:
manye kṛṣṇaṁ ca rāmaṁ caprāptāv iha surottamausurāṇāṁ mahad-arthāyagargasya vacanaṁ yathā
Translation:
In my opinion, Kṛṣṇa and Balarāma must be two exalted demigods who have come to this planet to fulfill some great mission of the demigods. Such was foretold by Garga Ṛṣi.