The principal Vedic hymn, gayatri, was generated from the skin, tristup from the flesh, anustup from the veins, and jagati from the bones of the lord of the living entities

Expressions researched:
"The principal Vedic hymn, gayatri, was generated from the skin, tristup from the flesh, anustup from the veins, and jagati from the bones of the lord of the living entities"

SB Canto 3

Thereafter the art of literary expression, uṣṇik, was generated from the hairs on the body of the almighty Prajāpati. The principal Vedic hymn, gāyatrī, was generated from the skin, triṣṭup from the flesh, anuṣṭup from the veins, and jagatī from the bones of the lord of the living entities.

SB 3.12.45, Translation:

Thereafter the art of literary expression, uṣṇik, was generated from the hairs on the body of the almighty Prajāpati. The principal Vedic hymn, gāyatrī, was generated from the skin, triṣṭup from the flesh, anuṣṭup from the veins, and jagatī from the bones of the lord of the living entities.