Agni Purāṇa

329 - An abridgement of rules of prosody relating to the Vedic metres

This chapter sums up second chapter of Pingala.

Agni said:

1. The Gayatri and the Goddess are of equal (number of) letters in the section on metres. It would have fifteen letters. (The metre called) Prajapati (consists of) eight letters. 

2. (The metre) Gayatri (used) in the Yajurveda (consists of) six letters and that in the Samaveda would have twelve letters. It would have eighteen letters in the Rugveda. Two more letters are added in the Sāmaveda. 

3. The fourth quarter in the Rugveda and all the quarters in the Prajapati would get lengthened. There would be increase of one syllable each in the rest. The Asuri would drop one (letter). 

4. (The metres) Ushņik, Anushtubh, Bruhatī, Pankti, Trishțubh and Jagatsshould be known as gradually (increasing). All these Gayatris (are known as) Brahma. 

5. If groups of three (of the above) are added each one would be the name of the metres) of the Rugveda and Yajurveda. Theyshould be written in a square of sixty-four chambers.