Agniveshyagrihyasutra 1.2.1.13

1.2.1.13

atha kārīrivrataṃ catūrātramakṣāralavaṇamaśamīdhānyaṃ bhūmau bhuñjīta paśuvaditi \

Now [concerning] the Kārīrī vow: for four nights he should eat food free of pungent herbs and salt, without pulses, on the ground, like an animal.