Shiva Purana

siva.sh/siva-purana/vayaviya-samhita/70/3

तदा विभक्तमभवच्चतुर्धैकं तदक्षरम् ॥ अ उ मेति त्रिमात्राभिः परस्ताच्चार्धमात्रया ॥ ३ ॥

sanskrit

Then that syllable divided itself into four, the three Mātrās—A, U, Ma and half the Mātrā thereafter.

english translation

tadA vibhaktamabhavaccaturdhaikaM tadakSaram ॥ a u meti trimAtrAbhiH parastAccArdhamAtrayA ॥ 3 ॥

hk transliteration by Sanscript

siva.sh/siva-purana/vayaviya-samhita/70/3

तदा विभक्तमभवच्चतुर्धैकं तदक्षरम् ॥ अ उ मेति त्रिमात्राभिः परस्ताच्चार्धमात्रया ॥ ३ ॥

sanskrit

Then that syllable divided itself into four, the three Mātrās—A, U, Ma and half the Mātrā thereafter.

english translation

tadA vibhaktamabhavaccaturdhaikaM tadakSaram ॥ a u meti trimAtrAbhiH parastAccArdhamAtrayA ॥ 3 ॥

hk transliteration by Sanscript