Valmiki Ramayana Bala Kanda Sarga 34 Shloka 21

महायशा: highly illustrious, विश्वामित्र: Visvamitra, भवानेव you, yourself, विशेषेण especially (you are similar to Brahma), सरिताम् among rivers, श्रेष्ठा the best, कौशिकी Kausiki, तव your, कुलोद्योतकरी brightening the image of your dynasty.

"Highly illustrious Viswamitra, you are similar to Brahma. Among the rivers, Kausiki is the best, refurbishing the image of your dynasty".