brahma jyotiḥ sanātanam

atha-thereafter; upasprsya-touching or taking bath in water; salilam-water; pranan ayamya-practicing trance; vak-yatah-controlling speech; dhyayan-meditating; jajapa-chanted within the mouth; virajam-pure; brahma-Gayatri hymns; jyotih-effulgence; sanatanam-eternal.