Mahabharata 9.41.9

विश्वामित्रवसिष्ठौ तावहन्यहनि भारतस्पर्धां तपःकृतां तीव्रां चक्रतुस्तौ तपोधनौ

viśvāmitravasiṣṭhau tāvahanyahani bhārataspardhāṃ tapaḥkṛtāṃ tīvrāṃ cakratustau tapodhanau

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