Srimad-Bhagavatam: Canto 8 - Chapter 1 - Verse 10
Sanskrit:
न वायं ब्रह्मबन्धुर्विष्णुर्मायाविनां वर: ।द्विजरूपप्रतिच्छन्नो देवकार्यं चिकीर्षति ॥ १० ॥
ITRANS:
na vāyaṁ brahma-bandhurviṣṇur māyāvināṁ varaḥdvija-rūpa-praticchannodeva-kāryaṁ cikīrṣati
Translation:
“This Vāmana is certainly not a brāhmaṇa but the best of cheaters, Lord Viṣṇu. Assuming the form of a brāhmaṇa, He has covered His own form, and thus He is working for the interests of the demigods.