Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 46
Sanskrit:
मज्जाया: पङ्क्तिरुत्पन्ना बृहती प्राणतोऽभवत् ॥ ४६ ॥
ITRANS:
majjāyāḥ paṅktir utpannābṛhatī prāṇato ’bhavat
Translation:
The art of writing verse, paṅkti, became manifested from the bone marrow, and that of bṛhatī, another type of verse, was generated from the life-breath of the lord of the living entities.