Jaiminīya (Talavakāra) Brāhmaṇa 1.82

1.82

krūramiva vā etadyajñasya kurvanti yaddhavidhāne grāvabhissomaṃ rājānaṃ hatvā
bahiṣpavamānaṃ sarpanti
kā tasya prāyaścittirityāhurapa upaspṛśeyuḥ
āpo vai sarvasya śāntiḥ
adbhirevainattacchamayanti
vāgvā etasmā agre'dhvane'tandrāyata bahiṣpavamānaṃ sarpantī
tāṃ prajāpatirabravīdbhāgadheyaṃ te karomyatha sarpeti
bahiṣpavamānaṃ sapsyanhomaṃ juhuyājjuṣṭo vāco bhūyāsaṃ juṣṭo vācaspatyuḥ
devi vāgyatte vāco madhumattasminmā dhāḥ
svāhā sarasvatyai iti
yatsarasvatyai svāhā iti juhuyādvācaṃ sarasvatīṃ svāhākāreṇa parigṛhṇīyāt
atha yatsvāhā sarasvatyai iti juhoti vācaṃ taduttarāṃ svāhākārāddadhāti
tayā parigṛhītayā yajñaṃ tanute
vācā hyūrdhvo yajñastāyate
vekurā nāmāsi preṣitā divyāya karmaṇe śivā nassuyamā bhava
satyāśīryajamānāya svāhā iti vā juhuyāt
vāgvai vekurā
brahma vāk
brahmaṇa eva tadvāce homaṃ hutvā sarpati nārtimārchati

They do something cruel, as it were, to the sacrifice, in that having slain King Soma with the stones in the havirdhāna shed, they glide out for the Bahiṣpavamāna chant. 'What is the expiation for that?' they say: they should touch water. Water indeed is the appeasement of all. It is with water that they appease it. Speech was sluggish at first for this journey as she glided out for the Bahiṣpavamāna chant. Prajāpati said to her: 'I will make a share for you; then glide!' When about to glide out for the Bahiṣpavamāna chant, he should make an offering: 'May I be pleasing to speech, pleasing to the lord of speech! O divine speech, what is sweetest of your speech, in that place me! Svāhā to Sarasvatī!' If he were to offer with: 'To Sarasvatī svāhā,' he would enclose speech, Sarasvatī, with the exclamation svāhā. But in that he offers with: 'Svāhā to Sarasvatī,' he thereby places speech after the exclamation svāhā. With her enclosed, he extends the sacrifice; for by speech the sacrifice is extended upward. Or he should offer: 'Vekurā is your name, dispatched for the divine work; be benevolent to us, easy to control, bringing true blessings to the sacrificer, svāhā!' Vekurā indeed is speech; speech is brahman. Having thus offered an oblation to the speech of brahman, he glides out; he does not suffer harm.