SB 3.12.46
majjayah panktir utpanna
brhati pranato ’bhavat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The art of writing verse, pankti, became manifested from the bone marrow, and that of brhati, another type of verse, was generated from the life-breath of the lord of the living entities.