Narapatijayacarya 3.1.3.10-3

The sound 'ha' is declared upon exiting, and the sound 'sa' upon entering.
The Moon, having the nature of Śakti, flows in the left subtle channel;
while in the right subtle channel flows the Sun, having the form of Śiva.
While in the right subtle channel flows the Sun, having the form of Śiva.

'Iḍā Piṅgalā,' etc.: clear; [these are] the names of the subtle channels. 'Prāṇa, Apāna,' etc.: the names of the ten kinds of winds are clear. 'Manifest,' etc.: within the body, in the middle of the body, the manifest, evident movement of the wind through the three subtle channels Iḍā, Piṅgalā, and Suṣumnā is observed, known, by the wise. 'Iḍā subtle channel,' etc.: the Iḍā subtle channel situated in the left nostril, the wind that moves there is Moon-bearing; the Moon exists there. Likewise, the Piṅgalā subtle channel situated in the right nostril, the wind that moves there is Moon-bearing; the Moon exists there. Likewise, the Piṅgalā subtle channel situated in the right nostril, the one that moves there is Sun-bearing; the Sun exists there. That which