Garudapurana 1.35

The glorious Garuḍa Mahāpurāṇa — 35
Hari said:
I shall explain the nyāsa and other rites of the Gāyatrī; listen, O Śaṅkara. / Its ṛṣi is Viśvāmitra, and Savitṛ is its deity;

having Brahmā as its head, Rudra as its crown lock, resting in the heart of Viṣṇu, / having viniyoga as its only eye, born in the gotra of Kātyāyana.

She should be known as having the three worlds as her feet and abiding in the belly of the earth. / Having thus comprehended Gāyatrī, one should recite [her] one million two hundred thousand times.

She should be known as having three lines of eight syllables [each], or four lines of six syllables [each]. / In recitation she is taught as three-lined, and in worship as four-lined.

In ritual placement, recitation, meditation, fire rituals, and worship, / one should constantly place Gāyatrī, who destroys all sins.

Know [her syllables to be placed] on the big toe, the middle of the ankle, the two shanks, the two knees, / the two thighs, the genitals, the testicles, the main channel, the navel, the slender belly,

the two breasts, the heart, the throat, the lip, the mouth, the palate, the two shoulders, / the two eyes, the brow, the forehead, the east, the south, the north,

the west, and the top of the head—I will state the colors [with each] form: / sapphire-blue, fiery, yellow, dark, tawny,

white, lightning-bright, star-like, black, red in succession, / dark, bright white, yellow, white like a ruby,

conch-colored, pale white, red like wine, / like the color of the sun, gentle, conch-shining, and white.

Whatever one touches with the hand, and whatever one sees with the eye, / all that becomes pure; they know nothing superior to Gāyatrī.

Thus ends the thirty-fifth chapter, titled 'Determination of the Ritual Placement of Gāyatrī,' in the Conduct Section of the first part in the first section of the glorious Garuḍa Mahāpurāṇa.