Shatapatha Brahmana 1.5.1.23

1.5.1.23

atha hotṛṣadanamupāvartate | sa hotṛṣadanādekaṃ tṛṇaṃ nirasyati nirastaḥ parāvasuriti purāvasurha vai nāmāsurāṇāṃ hotā sa tamevaitaddhotṛṣadanānnirasyati

He steps beside the Hotri's seat, takes one stalk of (reed) grass from the Hotri's seat and casts it outside (the sacrificial ground), with the formula, 'Ejected is the wealth-clutcher (parâvasu, lit. "off-wealth")!' Formerly, namely, the Hotri of the Asuras was one Parâvasu by name: him he thereby ejects from the Hotri's seat.