sa eva hi dadau bhagam
paroksam asuran prati
yajamano ’vahad bhagam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
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.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Because of Visvarupa’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.