Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 40
Sanskrit:
ऊर्जायां जज्ञिरे पुत्रा वसिष्ठस्य परन्तप ।चित्रकेतुप्रधानास्ते सप्त ब्रह्मर्षयोऽमला: ॥ ४० ॥
ITRANS:
ūrjāyāṁ jajñire putrāvasiṣṭhasya parantapacitraketu-pradhānās tesapta brahmarṣayo ’malāḥ
Translation:
The great sage Vasiṣṭha begot in his wife, Ūrjā [sometimes called Arundhatī], seven spotlessly great sages, headed by the sage named Citraketu.