Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.1.15

7.2.1.15

athāsandīṃ śikyam | rukbhapāśamiṇḍve tatparārdhe nyasyati nairṛto vai pāśo nirṛtipāśādeva tatpramucyate yaṃ te devī nirṛtirābabandha pāśaṃ grīvāsvavicṛtyamityanevaṃviduṣā hāvicṛtyastaṃ te viṣyāmyāyuṣo na madhyādityagnirvā āyustasyaitanmadhyaṃ yaccito gārhapatyo bhavatyacita āhavanīyastasmādyadi yuvāgniṃ cinute yadi sthavira āyuṣo na madhyādityevāhāthaitam pitumaddhi prasūta ityannaṃ vai piturathaitadannamaddhi pramukta ityetattriṣṭubbhirvajro vai triṣṭubvajreṇaiva tatpāpmānaṃ nirṛtimapahate

The seat, the netting, the sling of the gold plate, and the two pads he throws down on the farther side (of the bricks),--the sling is sacred to Nirriti: from Nirriti's sling he is thus freed. [He throws them down, with Vâg. S. XII, 65] 'The indissoluble bond which the divine Nirriti hath fastened upon thy neck,'--indissoluble indeed for him who does not know this;--'that (bond) of thine I unloose, as from the middle of Âyus,'--Âyus doubtless is Agni, and his middle (body) is that Gârhapatya which has been built;--not yet built is the Âhavanîya: hence whether a youth builds the altar, or an old man, he says 'as from the middle of Âyus;'--'now, being urged forward, eat thou this nourishment!' nourishment means food: thus, 'now, set free, eat thou this food.' With Trishtubh verses (he performs this rite), for the Trishtubh is a thunderbolt: it is thus with a thunderbolt that he repels evil, corruption.