Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.3.7

1.5.3.7

tadu tathā na kuryāt | yatraiva tiṣṭhanprayājebhya āśrāvayettata eva nāpakrāmedyatro eva samiddhatamam manyeta tadāhutīrjuhuyātsamiddhahomena hyeva samṛddhā āhutayaḥ

This, however, he should not do; he should not move from that same spot where he may be standing when he calls for the fore-offerings. Let him rather offer the (five) oblations in that part (of the fire) where he thinks there is the fiercest blaze; for only by being offered in blazing (fire), oblations are successful.