O demigods, I instruct you to approach Visvarupa, the son of Tvasta, and accept him as your guru. He is a pure and very powerful brahmana undergoing austerity and penances

Expressions researched:
"O demigods, I instruct you to approach Visvarupa, the son of Tvasta, and accept him as your guru. He is a pure and very powerful brahmana undergoing austerity and penances"

Srimad-Bhagavatam

SB Canto 6

O demigods, I instruct you to approach Visvarupa, the son of Tvasta, and accept him as your guru. He is a pure and very powerful brahmana undergoing austerity and penances.

SB 6.7.25, Translation and Purport

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.

Lord Brahmā advised the demigods to accept the son of Tvaṣṭā as their spiritual master although he was always inclined toward the benefit of the asuras.