O Mahārāja Parīkṣit, the demigods were related to Viśvarūpa from his father’s side, and therefore he visibly offered clarified butter in the fire while chanting mantras such as indrāya idaṁ svāhā [“this is meant for King Indra”] and idam agnaye [“this is for the demigod of fire”]. He loudly chanted these mantras and offered each of the demigods his proper share.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स वै बर्हिषि देवेभ्यो भागं प्रत्यक्षमुच्चकैः । अददद्यस्य पितरो देवाः सप्रश्रयं नृप
sa vai barhiṣi devebhyo bhāgaṃ pratyakṣamuccakaiḥ | adadadyasya pitaro devāḥ sapraśrayaṃ nṛpa
SB 6.9.2