Śatapatha Brāhmaṇa ("of a hundred paths") 3.2.1.38

3.2.1.38

atha yadvācaṃ yacati | vāgvai yajño yajñamevaitadātmandhatte 'tha yadvācaṃyamo vyāharati tasmādu haiṣa visṛṣṭo yajñaḥ parāṅāvartate tatro vaiṣṇavīmṛcaṃ vā yajurvā japedyajño vai viṣṇustadyajñam punarārabhate tasyo haiṣā prāyaścittiḥ

And when he restrains his speech--speech being sacrifice--he thereby appropriates the sacrifice to himself. But when, from speech restrained, he utters any sound (foreign to the sacrifice), then that sacrifice, being set free, flies away. In that case, then, let him mutter either a rik or a yagus addressed to Vishnu, for Vishnu is the sacrifice: thereby he again gets hold of the sacrifice; and this is the atonement for that (transgression).