He made even the illustrious Vasishtha to suffer the grief of the premature death of his sons. He was originally a Kshatriya, but has become a Brahmana by his own strength (of asceticism). He created a deep river of strong currents for the purposes of ablutions. That holy river is still known in the world by the name of Kaushika.
महाभागं वसिष्ठं यः पुत्ररिष्टैर्व्ययोजयत्। क्षत्रजातश्च यः पूर्वमभवद् ब्राह्मणो बलात्॥ शौचार्थं यो नदी चक्रे दुर्गमां बहुभिर्जलैः। यां तां पुण्यतमां लोके कौशिकीति विदुर्जनाः॥