Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 3


स एव हि ददौ भागं परोक्षमसुरान् प्रति ।यजमानोऽवहद् भागं मातृस्‍नेहवशानुग: ॥ ३ ॥


sa eva hi dadau bhāgaṁparokṣam asurān pratiyajamāno ’vahad bhāgaṁmātṛ-sneha-vaśānugaḥ


Although offering clarified butter in the sacrificial fire in the name of the demigods, without the knowledge of the demigods he also offered oblations to the demons because they were his relatives through his mother.


Because of Viśvarūpa’s affection for the families of both the demigods and the demons, he appeased the Supreme Lord on behalf of both dynasties. When he offered oblations in the fire on behalf of the asuras, he did so secretly, without the knowledge of the demigods.