Kautilya's Arthashastra 3.13.6

3.13.6

sakṛdātmādhātā niṣpatitaḥ sīdet, dvir anyenāhitakaḥ, sakṛd ubhau paraviṣayābhimukhau //

Any person who has once voluntarily enslaved himself shall, if guilty of an offence (nishpatitah), be a slave for life. Similarly, any person whose life has been twice mortgaged by others shall, if guilty of an offence, be a slave for life. Both of these two sorts of men shall, if they are once found desirous to run away to foreign countries, be slaves for life.