Śatapatha Brāhmaṇa ("of a hundred paths") 1.2.1.3

1.2.1.3

sa yaḥ kapālānyupadadhāti | sa upaveṣamādatte dhṛṣṭirasīti sa yadenenāgniṃ dhṛṣṇivopacarati tena dhṛṣṭiratha yadenena yajña upālabhata upeva vā enenaitadveṣṭi tasmādupaveṣo nāma

He who puts the potsherds on (the fire), takes the shovelling-stick (upavesha), with the text (Vâg. S. I, 17 a): 'Bold (dhrishti) art thou!' For since with it he, as it were, attacks the fire boldly, therefore it is called dhrishti. And since with it he touches (the coals) at the sacrifice, since with it he attends to (upa-vish) this (Gârhapatya fire), therefore it is called upavesha.