Skandapurana 5.207.63

5.207.63

trirātrabhojī paścācca sa babhūva munīśvaraḥ.
tāvatkālaṃ phalairninye tāvatkālaṃ jalāśanaḥ..
vāyubhakṣastato bhūyastāvatkālamabhūnmuniḥ..63..

After that, the lord of sages ate only every three nights; / an equal amount of time he passed on fruits, and an equal time subsisting on water; / then, subsisting on wind, the sage remained for an equal amount of time.