Shatapatha Brahmana 6.6.4.15

6.6.4.15

atha yadyāgnīdhrīyo 'nugacet | gārhapatyaṃ vāva sa gacati gārhapatyāddhi sa āhṛto bhavati gārhapatyādevainam prāñcamuttareṇa sado hṛtvopasamādhāya prāyaścittī karotyatha yadi gārhapatyo 'nugacettasyokto bandhuḥ

And if the Âgnîdhrîya fire were to go out, it is doubtless to the Gârhapatya that it goes, for from the Gârhapatya it has been taken. Having taken it from the Gârhapatya eastward along the north of the Sadas, and put fuel on it, he performs two expiations. And if the Gârhapatya were to go out, the meaning (procedure) of that has been explained.