Kautilya's Arthashastra 2.36.38

2.36.38

sūtikācikitsakapretapradīpayānanāgarikatūryaprekṣā.agninimittaṃ mudrābhiś cāgrāhyāḥ //

Those who go out at night in order to attend to the work of midwifery or medical treatment, or to carry off a dead body to the cremation or burial grounds, or those who go out with a lamp in hand at night, as well as those who go out to visit the officer in charge of the city, or to find out the cause of a trumpet sound (turyapreksha), or to extinguish the outbreak of fire or under the authority of a pass shall not be arrested.