Yājñavalkya Śikṣā 48

48

uttānaṃ sonnataṃ kiñcitsuvyaktāṅgulirañjitam
svaraviddhaṃ karaṃ kuryātprādeśoddeśagāminam

One should make the hand upturned, slightly elevated, adorned with clearly separated fingers, / pierced by the accent, moving toward the span-measure [of the chest].