Job alludes to the slave (in the Hebrew slave is the word–eved) and discriminates between him, and the hireling—(saickeer.) Job vii.-2. This is really the only time the Isaelites are mentioned as having “slaves” themselves. Previously this custom was a wild notion, slaves having slaves? But it shows up here, which is considered chronologically, thought not textually, part of the Genesis time period (pre-Exodus). The next time the slave/servant idea appears is in Isaiah (42) where the prophet is complaining how blind, deaf and dumb his fellows are.
A servant is a slave not hireling, is in our modern day, an employee. According to the custom (Deut. xxiv. 14, 15 see below) the hireling is a person who earnestly desires his wages while the servant – slave receiving no wages, desires only the hour of rest.
14You shall not oppress a hireling who is poor and needy, whether he be of your brothers, or of a foreigner who is in your land & within your gates of protection: 15 in his day you shall give him his hire, & neither shall the sun go down but you should pay him regularly. for he is poor, and he needs it as well as sets his heart on it: Do not let him cry against you to Yahweh, as it should be sin to you.
In my anguish... 