Mahabharata 9.38.22

यत्र तप्तं तपो घोरमार्ष्टिषेणेन भारतब्राह्मण्यं लब्धवांस्तत्र विश्वामित्रो महामुनिः

yatra taptaṃ tapo ghoramārṣṭiṣeṇena bhāratabrāhmaṇyaṃ labdhavāṃstatra viśvāmitro mahāmuniḥ

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