Mahabharata 14.55.1

जनमेजय उवाच · janamejaya uvāca

उत्तङ्कः केन तपसा संयुक्तः सुमहातपाःयः शापं दातुकामोऽभूद्विष्णवे प्रभविष्णवे

uttaṅkaḥ kena tapasā saṃyuktaḥ sumahātapāḥyaḥ śāpaṃ dātukāmo'bhūdviṣṇave prabhaviṣṇave

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