Shatapatha Brahmana 9.1.1.44

9.1.1.44

tadāhuḥ | kathamasyaitacatarudriyam mahadukthamāpnoti katham mahatokthena sampadyata iti yānyamūni pañcaviṃśatiryajūṃṣyabhito 'śītīḥ sa pañcaviṃśa ātmā yatra vā ātmā tadeva śirastatpakṣapucānyatha yā aśītayaḥ saivāśītīnāmāptiraśītibhirhi mahadukthamākhyāyate 'tha yadūrdhvamaśītibhyo yadevādo mahata ukthasyordhvamaśītibhya etadasya tadevamu hāsyaitacatarudriyam mahadukthamāpnotyevam mahatokthena sampadyate

As to this they say, 'How does this Satarudriya of his attain to (conformity with) the Great Litany?--how does it correspond to the Great Litany?' Well, those twenty-five formulas which there are on both sides of the eighties, they are the twenty-five-fold body; and where the body (of the altar-bird) is, that (includes) the head, and the wings and tail. And what eighties (of formulas) there are (in the Satarudriya), thereby indeed the (corresponding) eighties (of the Mahad uktham) are obtained, for by eighties the Great Litany is recited. And what there is (in the Satarudriya) after the eighties that is for him the same as what there, in the Great Litany, is after the eighties; and in this way this Satarudriya of his attains to (conformity with) the Great Litany; in this way it corresponds to the Great Litany.