Śatapatha Brāhmaṇa ("of a hundred paths") 13.5.2.16

13.5.2.16

etasyāmuktāyāmutthāya s!daso'dhi prāñco yajamānamabhyāyantyagreṇa havirdhāne āsīnametya yathāyatanam paryupaviśanti

When this (verse) has been uttered, they rise and betake themselves from the Sadas eastwards to the Sacrificer. Haying come to him, seated in front of the Havirdhâna (shed), they sit down in their several places.