Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.38

14.2.2.38

svāhā rudrāya rudrahūtaya iti ahutvaiva dakṣiṇekṣamāṇaḥ pratiprasthātre prayacati taṃ sa uttarataḥ śālāyā udañcaṃ nirasyatyeṣā hyetasya devasya dikṣvāyāmevainametaddiśi prīṇātyatha yanna prekṣate nenmā rudro hinasaditi

[Vâg. S. XXXVIII, 16,] 'Hail to Rudra, praised by the Rudras!'--even without offering (with this, the seventh stick), he, looking southwards, hands it to the Pratiprasthâtri, and the latter throws it outside (the offering-ground) northwards to the north of the hall, for this is the region of that god: he thus gratifies him in his own region. And as to why he does not look at it, he does so thinking, 'Lest Rudra should do me harm.'