O demigods, I instruct you to approach Viśvarūpa, the son of Tvaṣṭā, and accept him as your guru. He is a pure and very powerful brāhmaṇa undergoing austerity and penances. Pleased by your worship, he will fulfill your desires, provided that you tolerate his being inclined to side with the demons.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तद्विश्वरूपं भजताशु विप्रं तपस्विनं त्वाष्ट्रमथात्मवन्तम् । सभाजितोऽर्थान् स विधास्यते वो यदि क्षमिष्यध्वमुतास्य कर्म
tadviśvarūpaṃ bhajatāśu vipraṃ tapasvinaṃ tvāṣṭramathātmavantam | sabhājito'rthān sa vidhāsyate vo yadi kṣamiṣyadhvamutāsya karma
SB 6.7.25