Todalatantra 2: Toḍalatantra, Dvitīyaḥ paṭalaḥ

The noble Śiva said:
Listen, O Goddess, I shall proclaim the essence of yoga in brief.
The body is like a tree whose roots are above and whose branches are below.

Whichever sacred bathing places exist in the macrocosm, those exist in the body;
whatever the form of the great macrocosm, of such form is the microcosm.

In the macrocosm there exist thirty-five million sacred bathing places;
seventy-two thousand are manifested [in the body], O you who are praised by heroes.

Among those, fourteen; and among those, an auspicious triad;
and among those, O Supreme Ruler, is the greatly steadfast one who grants liberation.

She who is Vāsukī, the Great Illusion, having the form of a serpent,
coiled three-and-a-half times, dwelling in the subterranean realm.

Listen with devotion in due order to the seven heavens, O Supreme Ruler:
Bhūrloka, Bhuvarloka, Svarloka, and Maharloka,

Janaloka, Tapoloka, and Satyaloka, O fair-faced one.
These are the seven heavens, O auspicious one; listen attentively to the subterranean realms:

Atala, Vitala, Sutala, Talātala,
Mahātala, Pātāla, and beyond that, Rasātala.

From Rasātala up to Satya[loka], the greatly steadfast one is established;
situated in the middle of the Meru [axis], the nāḍī is greatly steadfast and grants liberation.

In Satyaloka is Mahāviṣṇu, Śiva named the macrocosm;
for the sake of beholding him, Vāsukī is ever longing.

When Vāsukī rises, having pierced through the six heavens,
then all [streams] that flow to the ocean become upward-flowing streams.

In this order, O Ruler of the gods, the nāḍīs are situated in the body:
iḍā, piṅgalā, and suṣumṇā stationed in the center.

If one fills the breath through both nāḍīs, O Ruler of the gods,
then by means of the prāṇa-mantra, Kuṇḍalī undertakes her ascent.

In the sahasrāra, the great lotus, the eternal and imperishable lotus,
filled with awe, Kuṇḍalinī enters the eternal abode.

All [streams] that flow downward to the underworld become upward-flowing streams.
At this time, O Goddess, one should contemplate the garland of letters.

One should recite with awareness the root mantra one hundred and eight times;
by that same path, the wise practitioner should bring [her] back to the mūlādhāra.

Having gratified the deities of the six cakras there with a stream of nectar—
now, O beloved, I shall describe another [practice]: yonimudrāsana.

Seated upon the seat, facing east or facing north,
the mantra-practitioner should make a firm binding of the two knees with the hands.

With an erect body, O Ruler of the gods, he should bring his nose down to the knees;
by means of the prāṇa-mantra, O Ruler of the gods, with great effort,

he should draw in the breath, O Supreme Ruler, and should not exhale any air;
keeping the body upright, O Supreme Ruler, then in reverse with great effort,

by the very rule spoken before, he should recite [the mantra] one hundred and eight times.
Having gratified the deities of the six cakras there with a stream of nectar,

he should bring [her] back by that same path to the mūlādhāra, O fair-faced one.
Yonimudrāsana pacifies endless diseases, O beloved.

Why say much, O Goddess? It destroys great afflictions.
Why say much, O Goddess? It is the cause of awakening consciousness in mantras.

This mudrā grants direct perception of the Self and bestows supreme liberation;
even if one had a hundred mouths, one could not describe it fully.

What [more] can I say now with five mouths, O ruler of the gods? / Even one afflicted with leprosy becomes shapely as Kāma.