Mahabharata 13.93.4

भीष्म उवाच · bhīṣma uvāca

मासार्धमासौ नोपवसेद्यत्तपो मन्यते जनःआत्मतन्त्रोपघाती यो न तपस्वी न धर्मवित्

māsārdhamāsau nopavasedyattapo manyate janaḥātmatantropaghātī yo na tapasvī na dharmavit

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