Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.3.11

9.2.3.11

vītaṃ haviḥ śamitaṃ śamitā yajadhyā iti | iṣṭaṃ sviṣṭamityetatturīyo yajño yatra havyametītyadhvaryuḥ purastādyajūṃṣi japati hotā paścādṛco 'nvāha brahmā dakṣiṇato 'pratirathaṃ japatyeṣa eva turīyo yajñastato vākā āśiṣo no juṣantāmiti tato no vākāścāśiṣaśca juṣantāmityetat

'The welcome oblation slaughtered by the slaughterer to sacrifice;'--that is, 'wished-for, much wished-for;'--'where the fourth sacrifice goeth to the offering,'--the Adhvaryu first mutters the formulas, the Hotri afterwards recites the verses, the Brahman mutters the Apratiratha (hymn) on the south side; this (set of verses), then, is the fourth sacrifice;--'may the prayers, the blessings favour us!'--that is, 'may both prayers and blessings favour us!'