Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.4.12

1.7.4.12

sa ājyasyopastīrya | dvirhaviṣo 'vadāyāthopariṣṭādājyasyābhighārayati tadyathaiva yajñasyāvadānamevametat

Let him not carry it (to the Brahman) along the front (east) side of the Âhavanîya fire); (though) some, it is true, do carry it along the front side. For on the front side stand the cattle facing the sacrificer: hence he would impose the power of Rudra on the cattle, if he were to carry it along the front side, and his (the sacrificer's) household and cattle would be overwhelmed. Let him therefore cross over in this way (behind the paridhis); for thus he does not impose Rudra's power on the cattle and he removes that (dart) sideways.