Skandapurana 5.167.189_7

5.167.189_7

brāhmamantraprabhāvena tasmādbrahmarṣimāhvaya ..
yena kīrtāmahe sarve viśvāmitraṃ dvijottamam.. 24 .

Therefore, by the power of the Vedic mantras, address him as a brahmarṣi,
whereby all of us may proclaim Viśvāmitra the best of dvijas!”