Śatapatha Brāhmaṇa ("of a hundred paths") 14.3.2.20

14.3.2.20

vācaḥ satyamaśīyeti vācā vā idaṃ sarvamāptaṃ tadvācaivaitadbhiṣajyati yatkiṃ ca vivṛḍhaṃ yajñasya paśūnāṃ rūpamannasya raso yaśaḥ śrīḥ śrayatām mayi svāhetyāśiṣamevaitadāśāste

'The truth of speech may I freely obtain,'--by speech everything is gained here: by speech he thus heals whatever has been unsuccessful in the sacrifice;--'may the form of cattle, the essence of food, fame, and prosperity accrue unto me, hail!'--a blessing he thereby invokes.