Śatapatha Brāhmaṇa ("of a hundred paths") 13.5.1.10

13.5.1.10

athāto niṣkevalyam mahānāmnyaḥ pṛṣṭham bhavanti sānurūpāḥ sapragāthāḥ śaṃsati sarve vai kāmā mahānāmnīṣu sarve kāmā aśvamedhe sarveṣāṃ kāmānāmāptyāindro madāya vāvṛdhe predam brahma vṛtratūryeṣvāvithe ti paṅktīśca ṣa+\padāśca śastvaikāhike nividaṃ dadhāti kLptam mādhyandinaṃ savanam

Then as to the Nishkevalya (-sastra). The Mahânâmnî (verses) are the Prishtha (-stotra); and he recites them along with the anurûpa (verses) and pragâtha (-strophes), for the obtainment of all the objects of his desire, for in the Mahânâmnîs, as well as in the Asvamedha, are contained all objects of desire. Having recited the paṅkti verses (I, 81, 1-9) 'Indra hath grown in ebriety and strength,' and the six-footed ones (VIII, 37, 1-7) 'This sacred work didst thou protect in fights with Vritra,' he inserts the Nivid in the (hymn) of the one-day's sacrifice. The midday-service is (thus) set right.