Mahabharata 15.35.24

न कृतं यत्पुरा कैश्चित्कर्म लोके महर्षिभिःआश्चर्यभूतं तपसः फलं संदर्शयामि वः

na kṛtaṃ yatpurā kaiścitkarma loke maharṣibhiḥāścaryabhūtaṃ tapasaḥ phalaṃ saṃdarśayāmi vaḥ

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