Atharvavedabrahmana 12.20

12.20

athāta ekāhasyaiva mādhyandinam | ṛk ca vā idamagre sāma
bāstāṃ(1), saiva nāmargāsīt | amo nāma sāma, sā vā ṛk sāmopāvadat, mithunaṃ sambhavāva prajātyā iti(2) | netyabravotsāma, jyāyān
vā ato mama mahimeti | te dve bhūtvopāvadatām | te na prativacanaṃ
samavadata| tāstisro bhūtvopāvadan | yat tisro bhūtvopāvadan, tat
tisṛbhiḥ samabhavat | yat tisṛbhiḥsamabhavat, tasmāttisṛbhiḥ stuvanti, tisṛbhirudgāyanti, tisṛbhirhi sāma sammitaṃ bhavati | tasmādekasya bahvyo jāyā bhavanti, na hyekasyā bahavaḥ sahapatayaḥ | yadvai tatsā
cāmaśca samavadatām, tat sāmābhavat | tat sāmnaḥ sāmatvaṃ
sāmaṃ bhavati śreṣṭhatāṃ gacchati | yo vai bhavati, sa sāmaṃ bhavati
asāmānya iti ha nindante | te vai pañcānyaṅbhūtvā pañcānyaṅbhūtvā
kalpetām, āhāvaśca hiṅkāraśca prastāvaśca prathamā codgīthasya
madhyamā ca pratihāraścottamā ca nidhanañca vaṣaṭkāraśca | te yat
pañcānyaṅbhūtvā pañcānyaṅbhūtvā kalpetāṃ, tasmādāhuḥ, pāṅkto yajñaḥ
pāṅktāḥ paśava dūti | yadu virājaṃ daśanīmabhisampadyeyātāṃ,
tasmādāhurvirājo yajño daśamyāṃ pratiṣṭhita iti| yadu bṛhatyāḥ
pratipadyate | bārhato vā eṣaḥ, ya eṣastapati | tadenaṃ svenarūpeṇa
samardhayati | dve tisraḥ karoti | punarādāyaṃ prajāyai rūpaṃ dvandvivāyo bhavataḥ | tata upaprajāyate