Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
इत्यद्धा मां समादिश्य गर्गे च स्वगृहं गते । मन्ये नारायणस्यांशं कृष्णमक्लिष्टकारिणम् ॥ २३ ॥
ITRANS:
ity addhā māṁ samādiśyagarge ca sva-gṛhaṁ gatemanye nārāyaṇasyāṁśaṁkṛṣṇam akliṣṭa-kāriṇam
Translation:
[Nanda Mahārāja continued:] After Garga Ṛṣi spoke these words to me and returned home, I began to consider that Kṛṣṇa, who keeps us free from trouble, is actually an expansion of Lord Nārāyaṇa.