Garudapurana 1.217.3

1.217.3

gāyattrīcchando viśvāmitra ṛṣistripāt /
samudrāḥ kukṣiścandrādityau locanau /
agnirmukham /
viṣṇurhṛdayam /
brahmarudrau śiraḥ /
rudraḥ śikhā /
upanaya ne viniyogaḥ /
oṃ bhūḥ pāde /
bhuvaḥ jānuti /
svaḥ hṛdaye /
mahaḥ śirasi /
janaḥ śikhāyām /
tapaḥ kaṇṭhe /
satyaṃ lalāṭe /
oṃ hṛdayāya namaḥ /
oṃ bhūḥ śirase svāhā /
oṃ bhuvaḥ śikhāyai vauṣaṭ /
oṃ svaḥ kavacāya huṃ /
oṃ bhūrbhuvaḥ svaḥ astrāya phaṭ //

The metre is Gāyatrī; the ṛṣi is Viśvāmitra; it has three feet. / The oceans are the belly; the moon and sun are the eyes; / fire is the mouth; / Viṣṇu is the heart; / Brahmā and Rudra are the head; / Rudra is the topknot. / The application is in the sacred thread ceremony. / Oṃ bhūḥ, on the feet; / bhuvaḥ, on the knees; / svaḥ, on the heart; / mahaḥ, on the head; / janaḥ, on the topknot; / tapaḥ, on the throat; / satyam, on the forehead. / Oṃ, to the heart, namaḥ; / oṃ bhūḥ, to the head, svāhā; / oṃ bhuvaḥ, to the topknot, vauṣaṭ; / oṃ svaḥ, to the armour, huṃ; / oṃ bhūrbhuvaḥ svaḥ, to the weapon, phaṭ.