Bhagavatapurana 4.7.27

4.7.27

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/0 ṛtvija ūcuḥ
tattvaṃ na te vayam anañjana rudra-śāpāt $ karmaṇy avagraha-dhiyo bhagavan vidāmaḥ &
tattvaṃ na te vayam anañjana rudra-śāpāt $ karmaṇy avagraha-dhiyo bhagavan vidāmaḥ &
dharmopalakṣaṇam idaṃ trivṛd adhvarākhyaṃ % jñātaṃ yad-artham adhidaivam ado vyavasthāḥ //

27. The Ritviks said:—O Lord unassailed by impurity (merit or demerit), we, blindly given to ritualistic duties, by virtue of Nandi's curse, do not understand Thy true nature. This form of Thine called Yajna, which is sung in the three Vedas and which implies (leads to), the acquisition of Dharma (merit and Apūrva) is to-day known (by us); and for that purpose (accomplishing it) all these restrictions and courses are laid down, on the subject of the Deity—[or for this purpose Thou hast assumed the different forms as Indra and so on].