DrāhŚS, 3, 4, 2.2 yo 'nupagītaṃ sāmādatte muṣyate rūkṣo bhāvuko bhavatyupagātṛbhyaḥ prasvaret prāṇo vai svaraḥ prāṇenaiva sāma saṃtanotīti valgutamaṃ sāmopagītaṃ bhavati tasmādapyupageyam //