Jaiminīya (Talavakāra) Brāhmaṇa 2-4.153

2-4.153

triśīrṣā ha vai tvāṣṭra āsa
tasya ha trīṇi mukhānyāsussomapānamekaṃ surāpānamekamannādanamekam
prastauti ha smaikenaikena gāyati pratiharatyekenāśrāvayatyekena
pratyāśrāvayatyekena śaṃsatyekena
sa ha smaikākyevānuparisarpaṃ sarvaṃ yajñaṃ saṃsthāpayati
sa heyadvīryāvānāsa
sa u hāsurīputra āsa
sa ha sma pratyakṣaṃ devebhyo vadati parokṣamasurebhyaḥ
yasmā u ha vā bhūyaḥ kāmayate tasmai parokṣaṃ vadati
tasmādu hendro bibhayāṃ cakāra yaccāsurīputra āsa yadu ceyadvīryāvānāsa
sa hekṣāṃ cakre'suryo vā ayamāsurīputraḥ
sa pratyakṣamasmabhyaṃ vadati parokṣamasurebhyaḥ
hantainaṃ hanānīti

Three-headed, indeed, was the son of Tvaṣṭṛ.
He had three mouths: one for drinking soma, one for drinking surā, and one for eating food.
With one he would chant the prelude, with one he would sing [the sāman], with one he would chant the response; with one he would call for recitation, with one he would respond to the call, with one he would recite.
He, creeping around entirely by himself, would bring the whole sacrifice to completion.
So full of vital power was he.
And he was the son of an Asura woman.
He would speak openly to the gods, but secretly to the Asuras.
For to whomsoever one desires more, to him one speaks secretly.
Therefore, Indra was afraid, because he was the son of an Asura woman and because he was so full of vital power.
He considered: "This son of an Asura woman is indeed an Asura.
He speaks openly to us, but secretly to the Asuras.
Come, let me kill him."