In Tretā-yuga, those members of human society who are fixed in religiosity and are sincerely interested in achieving the Absolute Truth worship Lord Hari, who contains within Himself all the demigods. The Lord is worshiped by the rituals of sacrifice taught in the three Vedas.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तं तदा मनुजा देवं सर्वदेवमयं हरिम् । यजन्ति विद्यया त्रय्या धर्मिष्ठा ब्रह्मवादिनः
taṃ tadā manujā devaṃ sarvadevamayaṃ harim | yajanti vidyayā trayyā dharmiṣṭhā brahmavādinaḥ
SB 11.5.25