Kautilya's Arthashastra 2.36.46

2.36.46

divase pañcarātre vā bandhanasthān viśodhayet /
karmaṇā kāyadaṇḍena hiraṇyānugraheṇa vā //

Once in a day or once in five nights, jails may be emptied of prisoners in consideration of the work they have done, or of whipping inflicted upon them, or of an adequate ransom paid by them in gold.