Mudgalapurana 3.37.29

3.37.29

tāṃ satyāṃ prakariṣyāmi mātṛbhaktiparāyaṇaḥ |
dehatyāgaṃ kariṣyāmi tadarthamathavā mune ||

Devoted to the reverence of my mother, I shall make it true,
or else, O sage, I shall abandon my body for that purpose.”