SB 4.1.40
urjayam jajñire putra
vasisthasya parantapa
citraketu-pradhanas te
sapta brahmarsayo ’malah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The great sage Vasistha begot in his wife, Urja [sometimes called Arundhati], seven spotlessly great sages, headed by the sage named Citraketu.