Mandukya Upanishad 3

3

jāgaritasthānaḥ bahiḥprajñaḥ saptāṅgaḥ ekonaviṃśatimukhaḥ sthūlabhuk
vaiśvānaraḥ prathamaḥ pādaḥ.

Stationed in the waking state, conscious of the external, having seven limbs [and] nineteen mouths, an experiencer of gross objects—
Vaiśvānara is the first quarter.