Mahabharata 13.4.47

ततो ब्राह्मणतां यातो विश्वामित्रो महातपाःक्षत्रियः सोऽप्यथ तथा ब्रह्मवंशस्य कारकः

tato brāhmaṇatāṃ yāto viśvāmitro mahātapāḥkṣatriyaḥ so'pyatha tathā brahmavaṃśasya kārakaḥ

Our plain-language meaning of this verse is waiting for scholar review.