Shiva Purana
तदा ब्रह्मसमादेशाद्देवी साक्षात्सरस्वती ॥ प्रसन्ना स्वादुसलिला प्रावर्तत नदीशुभा ॥ ३ ॥
Then at the behest of Brahmā the delighted goddess Sarasvatī herself flowed as an auspicious river of sweet water.
english translation
tadA brahmasamAdezAddevI sAkSAtsarasvatI ॥ prasannA svAdusalilA prAvartata nadIzubhA ॥ 3 ॥
hk transliteration by Sanscript