Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.1.3

1.5.1.3

taddhaike | vede stīrṇāyai barhirabhipadyāśrāvayantīdhmasya vā śakalamapacidyābhipadyāśrāvayantīdaṃ vai kiṃcidyajñasyedaṃ yajñamabhipadyāśrāvayāma iti vadantastadu tathā na kuryādetadvai kiṃcidyajñasya yairidhmaḥ saṃnaddho bhavatyagniṃ sammṛjanti tadveva khalu yajñamabhipadyāśrāvayati tasmādidhmasaṃnahanānyevābhipadyāśrāvayet

Here now some utter the call after taking sacrificial grass (barhis) from the covered altar, or they utter the call after cutting off and taking a chip of fire-wood, arguing, 'this, surely, is something belonging to the sacrifice; after taking hold of this, the sacrifice, we will utter the call.' Let him, however, not do this; for that also wherewith the firewood was tied together and wherewith they sweep the fire is, doubtless, something belonging to the sacrifice; and thus indeed he utters his call after taking hold of the sacrifice: for this reason let him utter the call after taking the fuel-band.