Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.5.4

4.2.5.4

tānvā etān | pañcartvijo yajamāno 'nvārabhata etāvānvaisarvo yajño yāvanta ete pañcartvijo bhavanti pāṅkto vai yajñastadyajñamevaitadyajamāno 'nvārabhate

The Sacrificer holds on to those five priests from behind, for as much as those five priests are, so much is the whole sacrifice, the sacrifice being fivefold: hence the Sacrificer thereby holds on to the sacrifice.