Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 28


तस्मान्मां कर्मभिर्विप्रा यजध्वं गतमत्सरा: ।बलिं च मह्यं हरत मत्तोऽन्य: कोऽग्रभुक्पुमान् ॥ २८ ॥


tasmān māṁ karmabhir viprāyajadhvaṁ gata-matsarāḥbaliṁ ca mahyaṁ haratamatto ’nyaḥ ko ’gra-bhuk pumān


King Vena continued: For this reason, O brāhmaṇas, you should abandon your envy of me, and by your ritualistic activities you should worship me and offer me all paraphernalia. If you are intelligent, you should know that there is no personality superior to me who can accept the first oblations of all sacrifices.


As stated by Kṛṣṇa Himself throughout Bhagavad-gītā, there is no truth superior to Him. King Vena was imitating the Supreme Personality of Godhead and was also speaking out of false pride, presenting himself as the Supreme Lord. These are all characteristics of a demonic person.