The great sage Vasiṣṭha begot in his wife, Ūrjā [sometimes called Arundhatī], seven spotlessly great sages, headed by the sage named Citraketu.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ऊर्जायां जज्ञिरे पुत्रा वसिष्ठस्य परन्तप । चित्रकेतुप्रधानास्ते सप्त ब्रह्मर्षयोऽमलाः
ūrjāyāṃ jajñire putrā vasiṣṭhasya parantapa | citraketupradhānāste sapta brahmarṣayo'malāḥ
SB 4.1.40